How to Refill a "disposable" Brita Brand Water Pitcher Filter With Activated Carbon.




Why buy a replacement filter for $6 to $10 (or more) when you can refill your old filter cartridge housing for about 50 cents?!

Refilling is quick, easy and economical. If you can refill a salt shaker, then you should be able to refill a Brita, PuR, or other brand water pitcher cartridges. All that you will need is an old cartridge, some activated carbon, a polyethylene plug, a sharp utility knife or Xacto knife. A 1/2" drill motor and 1/2" drill bit are optional, but can aid in rounding out the hole.

Step 1: A Bit About Activated Carbon and Where to Buy Small Quantities.

Activated carbon is also known as activated charcoal and is a VERY effective substance at absorbing many unwanted contaminants in drinking water and other liquids.

The History of Activated Carbon

Activated Carbon was first known to treat water over 2000 years ago. However, it was first produced commercially at the beginning of the 20th century and was only available in powder form. Initially activated carbon was mainly used to decolorize sugar and then from 1930 for water treatment to remove taste and odor. Granular activated carbon was first developed as a consequence of WWI for gas masks and has been used subsequently for water treatment, solvent recovery and air purification. The unique structure of activated carbon produces a very large surface area: 1 lb of granular activated carbon typically provides a surface area of 125 acres (1 Kg =1,000,000 sq. m.). Activated carbon can be produced from a variety of carbonaceous raw material, the primary ones being coal, coconut shells, wood and lignite. The intrinsic properties of the activated carbon are dependent on the raw material source. The activated carbon surface is non-polar which results in an affinity for non-polar adsorbates such as organics. Adsorption is a surface phenomenom in which an adsorbate is held onto the surface of the activated carbon by Van der Waal's forces and saturation is represented by an equilibrium point. These forces are physical in nature, which means that the process is reversible (using heat, pressure, etc.) Activated carbon is also capable of chemisorption, whereby a chemical reaction occurs at the carbon interface, changing the state of the adsorbate (dechlorination is an example of a chemisorption process). (You can read more here: )

Activated charcoal is good at trapping other carbon-based impurities ("organic" chemicals), as well as things like chlorine. Many other chemicals are not attracted to carbon at all -- sodium, nitrates, etc. -- so they pass right through. This means that an activated charcoal filter will remove certain impurities while ignoring others. It also means that, once all of the bonding sites are filled, an activated charcoal filter stops working. At that point you must replace the filter. (You can read more here: )

Over 100 years ago Ellen White, a health reformer & pioneer of the Seventh Day Adventist movement strongly advocated the medical uses for charcoal powder. The modern medical establishment has only recently begun to use activated charcoal powder as the preferred method of treating oral poisonings and drug overdoses: "It is thought to bind to poison and prevent its absorption by the gastrointestinal tract. In cases of suspected poisoning, medical personnel either administer activated charcoal on the scene or at a hospital's emergency department. Dosing is usually empirical at 1 gram/kg of body weight, usually given only once. Depending on the drug taken, it may be given more than once. In rare situations activated charcoal is used in Intensive Care to filter out harmful drugs from the blood stream of poisoned patients. Activated carbon has become the treatment of choice for many poisonings, and other decontamination methods such as ipecac-induced emesis or stomach pumps are now used rarely." (From the Wikipedia entry for Activated Carbon)

You can find it at any fish & aquarium supply. If your concerned that the quality of the carbon from an aquarium shop might not be up-to-snuff, then go to a homebrew shop, or some other source that you are comfortable with. The granule size you'll want should be relatively close to 8 x 16 mesh size or smaller, but NOT so small that it falls out of the holes in your filter housing. I purchased the NSF approved carbon I used for my filters through an ebay merchant (here: ). No, that's not me, & I don't know them. :) They describe their products well and have a good reputation & that's why I've included them here.

Step 2: The Polyethylene Plug

This is something you can find at a hardware store. They come in different colors and styles, so don't let that distract you... color isn't important and type is up to your own judgment. What is important is the size. You want a plug that is slightly over 1/2" at the widest point of the tapered sides. Vernier calipers would be a useful item to take with you to measure this dimension when you go to the store. This should cost less than 25 cents.

Step 3: Making the Hole.

You will notice on the top of the Brita filter cartridge some radial slots for allowing water into the filter. The overall diameter of the slot pattern is just under 1/2". I've drawn a black line where you'll want to make your cuts. As the plastic is thin, be careful not to get too happy with the knife... stay calm. :)

Dump out the original contents. You will notice what look like little glass beads in with the charcoal... I believe these are resin beads and are primarily used to remove heavy metals. Have your water tested to see if you have heavy metals that you would want removed. If so, you'll likely want to go with a filtration system that includes these beads.

As a side-note, some of the PuR filters (owned by Proctor & Gamble) now (as of March, 2008) come with a timed release version of sodium fluoride, which is toxic to mammals. You can read up on the fluoride controversy here ( ), or you can Google the terms fluoride + poison. (2013 Update: PuR no longer sells their filters that "adds benificial flouride to your water")

Once you've got the hole roughed out, you can smooth it round with your knife, or you can use a 1/2" drill bit to ream out the hole. If you use the bit, set the drill on the higher gear range, as the faster bit speed will make a smoother, rounder hole. While you want a fast bit RPM, you want to insert the bit into your rough hole slowly so that you don't end up with tears in the plastic. You can actually use the fast moving bit to melt the hole, which will preserve the integrity of the plastic. Reversing the drill will provide friction/heat & help prevent tearing the plastic.

Finish up this step by trimming any excess plastic from around the hole and dry-fitting your plugs. Adjust the hole diameter with your knife as necessary... this isn't rocket science, the hole simple has to be tight enough to retain the plug so that the rim/shoulder of the plugs sits parallel with the surface, as shown in the photo.

Step 4: Filling & Using the Housing.

Before filling the housing, you may want to wash it then soak it in a bleach solution to kill any cooties that may have formed in the housing. Chlorine bleach, sodium hypochlorite, is a VERY potent antimicrobial, which means "a little dab will do ya". 8 drops of bleach per gallon of water is a stronger solution than any public pool or spa that I've ever been in and is the ratio that the World Health Organization recommends for purifying pretty ugly water for drinking. Personally, I think that ratio is overkill, but they probably want to err on the side of safety.

Rinse the housing thoroughly when done soaking... there's no need to dry it. Place the funnel in the hole and fill with activated carbon. You may want to tap the housing on your counter to settle the granules and top it off, allowing room for the plug. Once plugged, you now have a filter that is more than likely more effective at taking out impurities than the original. Why? because you filled it fuller and you used ONLY pure carbon with no fillers. It should filter more water before needing changed than an original filter.

You also may want to poke some holes in the "dome" on the top of the housing to allow water to flow into that area of the housing. A hot pin or needle works well for this. This replaces the holes that we cut out and plugged in step 3.

Treat this filter just as you would a new one... soak it in water for 15 minutes to make sure the carbon is saturated. Expect that there will be some fine charcoal powder that settles out in your first couple of batches or so. This won't hurt you to drink it with your water or let it settle out.. :-) When your filter is not in use, put it in a ziploc plastic bag and store it in the fridge to prevent it from growing funk. I haven't tried storing them in the freezer yet... that would definitely slow any growth down, but I don't know if it would cause the ice to break the carbon into finer particles that could escape the housing. I just haven't tried it yet.

This is my first instructable... questions, comments and critique are welcome and encouraged. Enjoy.



I appreciate all of the comments... even the ones that ask the hard questions or bring up shortcomings or potential shortcomings in this instructable.

First off, let me say that this filter makeover is NOT intended to do ALL that the Brita filters claim to do, but just do what the activated carbon portion performs, which meets my needs very well. I live in a small community of about 50 individuals in the high plains of N.E. New Mexico, and the water hardness is just under 1000 parts per million (ppm), which are largely sulphates with some sodium, so we don't use that water for drinking or cooking. We distill some of our water in solar and electric distillers, and also collect rainwater from our metal roofs. Because of the quantity of dust, pollen, algae spores and other organic matter (bird poop, etc.) that settles on our roofs, we filter our water through a multi-stage filter bank that concludes with a .5 micron carbon block filter. Each week we consume about 250 to 300 gallons of rainwater alone, so water filtration is a requirement, but at the same time, we're not going to lose sleep over what get through the carbon. The filter pitchers that we use are primarily to remove any off-flavors that may not be entirely removed by the carbon block, and this the granulated carbon does remarkably well. Refilling these filters amounts to a substantial annual cost savings for us. In the last two months I've refilled over 30 of these filters with the NSF certified granulated activated carbon that I linked to on page 1 < >.

Everyone should have their water tested and judge from the test results what type of filtration you NEED. Be intelligent. Why pay for something you don't use? Use your own judgment as to whether a carbon-only filter is suitable for your situation. I hate fear/ignorance stimulated marketing tactics that are used by some water filter companies (or any company) to get folks to buy their product out of fear and ignorance. I will try to dispel the concerns that some have suggested in the comments.

For those who are concerned that the quality of the carbon that they might encounter at an aquarium shop, and feel they need FDA "food grade" certification or on their activated carbon, I WOULD ENCOURAGE YOU TO FIND A SOURCE THAT YOU ARE COMFORTABLE WITH AND BUY FROM THEM. YOU MAY EVEN WANT TO SHARE WHAT YOU FIND... POST THEIR CONTACT INFO HERE in a comment. The carbon source I linked to sell NSF certified carbon. Really, though, I think the amount of concern over this point is overstated, as aquarium fish tend to be very sensitive to certain impurities and the folks that make the carbon for that application are very aware of this... they don't want anything in the filter media they sell, as it's not good for business. Personally, I would trust a vet supply (or aquarium shop) over the FDA any day of the week. The FDA approves toxins for food additives (sodium fluoride, Aspartame, MSG, etc.) while forbidding beneficial or benign ingredients (stevia, numerous medicinal herbs, etc.). It's usually about corporate money & bribes.

Anyone with a source for alternate or superior filter media are encouraged to post their findings and URLs in the comments.

For those with a concern about medications that may be in your city water supply (I'm assuming from the city recycling the waste water), if it's a carbon based/organic medication, then carbon should filter that out. Do your research, be responsible, be wise. Do what works for you.

If you have a concern about the carbon becoming a medium for microbes to flourish, one of the best ways to slow that process down is to lower the temperature of your filter by keeping the pitcher in fridge. Keep in mind that carbon removes (adsorbs) organic, carbon based impurities as well as chlorine... which also includes what decomposing residue that results from the organic impurities "rotting" that get caught by the carbon... molds, fungi, yeast, mildew... microbes in general. In other words, the "fresh" stuff that gets trapped by the filter and begins to decompose remains to be trapped by the carbon UNTIL the carbon has reached saturation. Unless your olfactory senses are totally fried, you should be able to tell by the taste of the water when the carbon is spent and in need of replacement. If you're one that is ultra sensitive to this kind of stuff, find out what works for you and stick with it. If you sleep better by using a corporate, consumer grade product, then by all means, do that.

If you're filtering water that has chlorine in it, the chlorine will likely reduce/retard/prevent the growth of microbes. The chlorine probably already killed all of the cooties BEFORE you ran them through the filter. Myself, I wouldn't worry about it unless you truly have a real and not imaginary need for additional filtration.


I purchased a book several years ago titled "The Egoscue Method of Health Through Motion" which had a disclaimer that really impressed me... it is included below and applies to this instructable, as well as life in general. Personal responsibility isn't for everyone, just those who appreciate freedom and don't care to blame others. :o)

"Ours is a highly litigious society. Which means, in plain English, we like to sue each other, blame each other, transfer responsibility to others.

Since, as you'll see, responsibility is a continuing theme of this book, the space which is usually reserved for what the lawyers refer to as the "disclaimer" is being used to make an additional and, I believe, more important point.

You've seen the words many times: "The following material is not intended as a substitute for the advice of a physician. The reader should consult a physician before embarking on this or any health program..."--- or words to that effect. The all-purpose liability firebreak.

Disclaimers are a legal necessity, but they are a cop-out. This material is no substitute for the reader taking responsibility for his or her own health. Therefore, I have an important recommendation to make: If you really need a disclaimer, close the book and put it back on the shelf unread.

I hope you don't, because what I have to say in the pages ahead will change your life. Pete Egoscue"


Anyone who is truly concerned about their health and is still eating meat and diary products are either ill informed or are not really concerned ENOUGH about their health. I would say the same thing applies to living/working in the city environment... it's not physically or spiritually healthy. I haven't been to a hospital for an illness in over 24 years, and the last 17 of those years I've been a vegetarian. I haven't been sick for almost three years... ever since I gave up eggs and dairy. I know about 50 other vegetarians who also stopped eating eggs and dairy products at the same time who also haven't been ill in almost three years. Be wise with what you do with your life.

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      242 Discussions


      2 years ago

      No way are enough people going to start sourcing carbon and plugs and getting out the drill in enough numbers to worry Brita about changing their filter model.

      I think refilling the filters is a great idea, but it would be even greater if they actually just sold refillable filters, with a top that you can open and refill. The easier it is to do, the more people will do it. (Especially since it would also save you money!)

      3 replies

      Reply 4 weeks ago

      Someone should make these and sell them on etsy and eBay.


      Reply 8 months ago

      You don't need plugs or drills, every filter has a magic spot that a firm squeeze with pliers will separate the cap and the body, due to the nature of what it does, this sea
      Is pretty much never going to be glued


      Reply 2 years ago

      I bought a new Brita pitcher with a filter last night and they have done exactly that! lol


      6 months ago on Introduction

      The WHO's chlorine dose really isn't overkill. For instance, the primary MCL for chlorine is 4 ppm for drinking water systems in the US, with a recommended secondary (aesthetic) MCL of 2 ppm (the required *minimum* is 0.2 ppm). Most plain household bleach is 3 to 3.5% NaOCl, which is about 46% Chlorine by weight. 8 drops of fresh normal-strength (unscented!) bleach per gallon will get you about 1.4 to 1.7 ppm. Some of that will be "consumed" by organics and other stuff it contacts. Disinfection is directly proportional to time, so let it soak for about 30 minutes.

      BTW, I look forward to trying this!


      6 years ago on Introduction

      How to Regenerate Activated Charcoal  eHow

      Activated charcoal is carbon in extremely porous form. It is usually derived from charcoal. It has a large surface area and is used for chemical reactions as a catalyst. It is also used in fish tanks as a filter or to filter distilled alcohol. Activated charcoal is an expensive product. It is cheaper to regenerate the charcoal than buying new activated charcoal

      Chemical Regeneration

      1. Soak the activated charcoal in a solution of 9 to 10 percent hydrogen peroxide. Handle the solution by wearing gloves as it can cause burns. You can also use distilled deionized water instead of the hydrogen peroxide solution.

      2. Stir the mixture every 15 minutes.

      3. When the solution has been absorbed, add more solution to the container. Repeat this many times.

      4. Bake the charcoal in an oven at 225 degrees Fahrenheit for an hour or two.

      1 reply

      Reply 1 year ago

      Just bake it. Most people can't buy hydrogen peroxide at that concentration anyway. Any temperature between 225 and 400 degrees is fine. Peroxides leave nasties behind. Steam regeneration is common but they go up to 900 with a controlled cooldown. It stinks, so winter isn't the best time to do it.


      1 year ago

      Any feed back on the Berkey Filters? I believe they are only Charcol but clain the best, etc.


      1 year ago

      I do have a comment about Brita filters in general, and that is - don't use them. They're the most expensive mistake you can make as far as water filtration. Yes, you can demonstrate chemically that there is a difference between input and output streams, but the data needs to be placed in context. And a simple demonstration will show why.

      I have a deep well fed by slow infiltration from clay beds, and if I am gone any length of time, silt will accumulate. Running the pump will clear it out after some length of time, but in a fit of pique, I once decided to test some various filter performances, and spent close to 60$ on a Brita and a refill set. I also bought a Pur refill, as that was what was attached to the kitchen sink (and still is).

      Pouring a gallon of turbid water through the Brita resulted in - a gallon of turbid water. Repeating the operation was an act of silliness. While I fully understand the operation of charcoal and zeolite, I also understand the operation of marketing fluff. A Brita filter can only operate on those substances that are actually dissolved. Undissolved solids including biologicals and chemistry that does not dissolve at neutral pH is unaffected by passive carbon filtration (like the Brita filter). I got better results by using a paper towel. Seriously.

      What I am trying to say is, you may derive SOME benefit from this outrageously expensive, marginally useful device, but it is mostly hype, and in fact hides by proxy many of the dangers you can face without proper laboratory testing.


      2 years ago

      Brita filters don't only contain activated charcoal, they also contain ion-exchange resin in important amounts. This is what removes the calcium and magnesium from water (esp. "hard" water), and it is primarily these two elements, along with the chlorine which the activated charcoal takes care of, which make water taste "funny". If you use only activated charcoal you're primarily removing only the chlorine. Ion-exchange resin also removes the heavy metals like copper and lead, which not only taste funny but are actually poisonous in amounts of more than a couple micrograms a day.

      So you just need bulk ion-exchange resin along with bulk activated charcoal and you're all set, right? Except that ion-exchange resin is SEVERAL TIMES more expensive than activated charcoal.

      Brita filters also contain an antibacterial : silver (as the cation). It's there to prevent bacteria from positively infesting the filter, which it would otherwise, as it's an EXCELLENT culture medium — party time for bacteria when they find it if the silver weren't there as a disinfectant.

      None of this is meant to discourage people from doing it — on the contrary, I would love to create a homemade Brita equivalent and applaud the entrepreneurship of others to try. But you need to know what you're doing, and I've noticed far too many people thinking they've licked the problem just because they've bought a big bag of activated charcoal. As you can see, the Brita filter is a "complete" product, with lots of money having been spent on research and development. It will be harder than people think to put together a similar product by buying the bulk "ingredients" separately, because the average person doesn't have the purchase power of a corporation of course — heck, if anything it will likely be MORE expensive.

      So it becomes a question of what you're willing to sacrifice — for most people, that will mean leaving out the ion exchange resin. That's fine but just be aware what it is and what it does, and the fact that, if you started filtering your water mainly because it tasted funny, and you leave out the resin in your homemade filter because it's too expensive, you're leaving out the main thing that's killing that weird taste.

      If anyone DOES manage to put together a similar (complete) product at a decent cost savings over original Brita filters, I would LOVE to know how you did it — what you put in, where you bought it, etc.


      2 years ago

      If you either need (as determined by chemical analysis) or "really totally need" (as determined by feels) the Ion filtration you can always buy and mix the resin beads in with the charcoal yourself. The exact ratio really depends on your personal water chemistry. I get Nuclear Grade mixed bed DI resin beads (findable on amazon and ebay) and fill the canister about 1/5 of the way with the beads and the rest of the way with activated charcoal and that works well enough for my tastes.

      Having drunk reactor grade water in my navy days (literally some of the purest stuff on the planet as reactors are really picky about what is in the water.) I prefer some minerals to "flavor" my water but to each their own.


      3 years ago

      Here is the newest and easiest way to not have to pay for those expensive Brita filters - Fits directly into your Brita and Pur pitchers. Now you just buy the REUSABLE two piece cartridge once and replace the Filter Pod refill every 40 gallons! More eco-friendly and less costly than Brita or Pur!

      1 reply

      Reply 3 years ago

      It still not clear... Would you please to explain what do you mean "buy the reusable two piece cartridge"? I NEVER saw reusable cartridges at stores and on internet AT ALL. Can you give me the information where can I get them? You can e-mail me at Thanks in advance!


      Reply 3 years ago

      I can't find any way to purchase those units on that web site. Nor any referral to stores that might carry them. ???


      3 years ago

      Good article.. I was going to blaaaah at you for not giving instruction to make your own fireworks grade charcoal..a.k.a. activated charcoal . But i re-read the heading . and great job.I made my own activated charcoal last winter and used it for air / water filtration and saved a ton of money for my fish n' check out diy charcoal on you's very cheap and really interesting.GO SCIENCE.!!


      3 years ago on Step 2

      You can get the plugs at most medical stores and at fastenals

      water filter

      4 years ago on Introduction

      I sell water filters in the Netherlands, and I would definitely not recommend Brita waterfilters. They hardly do anything. Sure I understand this cheap way of replacing the cartridges, but if you really want you water without toxins there are real solutions out there that do that. There are charts that give a good comparison. I think Zero Water offers the best Brita like filter, that actually works. You can also look up on youtube: Brita vs Aquaphor. It's quite interesting