Installing/Replacing a Cartridge Pool Filter




About: Engineer making renewable energy products for African entrepreneurs.

Is your pool filter old? Did it just rip open while under pressure dropping the water level in your pool by 4 feet? Well, here's how to fix that.

An explanation on the second picture.... My house is about 30 years old. It was the house that the community developer built for himself. So -- there's a ton of features that came with the house that we just can't figure out of even find :P

For instance -- in the second picture there's 3 PVC tubes that go into the ground... don't know where they go - but they're there. The house even has a connected cabana house. It's connected to the structure, but you can't walk through the house to get there. Funny thing is -- there's no record that it was built.... So that's why there's a lot of photonotes about unknown things :P

Step 1: Acquire Components

You'll need the necessary PVC components adapters etc. as your system requires.

You'll also need a replacement filter. These can get expensive. Locally, we were looking at $400 + a required $75 installation fee.

Not wanting to pay that much, I (given the task of finding and installing a filter) turned to eBay.

Neely's Pools is the eBay store I bought from. The service was great - talked with them over the phone and shipping took just under a week going from Oregon to South Florida. In return for their service, I'm recommending them ;)

Another thing to consider about replacing a filter is branding. I'm not one that likes to be brainwashed by branding. In this case, finding larger brand for replacement parts and cartridges is a VERY good thing ;)

I ended up with a Hayward C17502. It has 175 sq.ft. of filtration area and a 2" female threaded connection.

My system uses 1 1/2" piping so an adapter is necessary. Additionally, it is a good idea to go for a bigger diameter pipe (as opposed to smaller) for your filter. This slows the flow across your filter and reduces head loss.

Step 2: Remove Old Filter

First, make sure the pump is off and will not turn on (VIA a timer etc.)

I used a reciprocating saw to cut the old pipe away. I also needed to disconnect an old oil furnace water heater. Be careful as there should be some water in the system. Allow the water to drain. Be sure to leave space to couple with the existing system.

Once all the piping is cut at the appropriate locations, remove the old filter.

Step 3: Rough in New Filter

After removing your old filter, place the new filter in its place. Be sure to check in input and return line positions.

Next, rough cut your PVC tubing and assemble without glue.

Step 4: Fine Tune and Cement (glue)

Make small adjustments for a better fit. Once you're happy/satisfied with the fit, begin priming and cementing liberally. If your filter uses a threaded connection, use Teflon tape and thread on that piece first.

After the assembly is cemented together, allow to cure for the recommended time (see your cement can). After the cement has cured, fire up the pump and pressure test.



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    7 Discussions


    Reply 11 years ago on Introduction

    they have a huge belly shots when pool gets reactivated


    12 years ago on Introduction

    If nothing is connected to the Solar on the roof, two or more of those "unknown destination" pipes will be connected to the pool for when the solar was connected (1 pipe to pool) (1 or 2 pipes from Pool. The Solar does not have anything to do with the filter and it's pump. If you decide to connect it again, you need a seperate pump to circulate the water seperately to the filter. Nice Instructable. Cheers. Mike

    1 reply

    The solar system and the filter system were all driven by the same pump - but the valves were removed when the system was taken down. It's hard to see - but there's a length of black tube below the pump outlet. There was a Y on outlet and that black valve would divert some of the flow up to the solar. What sucks about that design is that the water doesn't get filtered first -- so debris can get caught in the panels -- bugger :P Perhaps it's done differently nowadays - but that's how the system was set up when we got it :P


    12 years ago

    Nice job! We have a very small pool (8,000 gal) and a screened enclosure so I can get away with cleaning the filter once every 3-4 months. I would never have a pool without an enclosure now, I'm spoiled!


    12 years ago

    If you want to prolong the life of that filter... its a good idea to every once in a while, (every two or three weeks, depending on the pool usage) take it out and rinse it down really well with a garden hose. Alot of crud can get caught up in the filter and keeping it clean keeps your pressure levels good. This will save you money so you don't have to go out and buy a new filter.

    1 reply

    Reply 12 years ago

    That's part of normal maintenance -- we try to clean our filter just about every week. Our pool is large (gallon wise) and is not covered, so all sorts of south Florida vegetation gets in there :P I didn't clean the old (dirty) filter before taking the picture :P It was just going into the trash :)