If you have an RV or a boat, you likely have a holding tank for sewage. If you have a holding tank, you have a problem with odor.  Right? It's the price we have to pay for having some of the necessary comforts of home in our RV or boat.

These holding tanks all have a vent, or they would explode, and if you thought odor was a problem.... 
Activated carbon, available as aquarium filter media, will remove the odor from vent gas.

I built a home made odor killer for the holding tank on our boat which solved the problem.

Step 1: Parts

I used these parts:

2" PVC pipe, 24" long
2" fittings for each end, the glue-on type. These fittings need to reduce down to a size where you can slide a length of clear vinyl tube over it. So, I used fittings that reduced town to a short length of 3/4" PVC pipe so that I could slide 1" vynl hose over it tightly.
1" vinyl tube
Activated carbon that can be bought at a pet store
Fine screen, like window screen, of fine wire screen.
<a href="http://www.bulkactivatedcarbon.net/Activated-Carbon-for-Water-Purification.html" rel="nofollow">http://www.bulkactivatedcarbon.net/Activated-Carbon-for-Water-Purification.html</a><br> <br> I bought from the site above, and it cames cheap and good.
<br> <br>I made something similar years back to replace pricey SeaLand ones. <br> Working on a charter boat with large tank and vertical pipe, I broke down <br>and purchased a household type after weighing in costs for the pvc parts to make one. <br> Also have found kitty-litter with activated charcoal works <br> well.
Thanks for the comment.<br><br>My general approach is &quot;why buy one if I can build it.&quot; But on occasion use common sense and economics when I have to.<br><br>Bill
<br> If I would of had the time, I would have thought it up and built it like the last one <br> Stinky charter boats do not get tips. Hooray for &quot;Fart Filters&quot;!
Very good project, Bill! <br> <br>I am thinking to make something like this. Here the activated carbon costs about 10 dollars/Kg. Maybe I will do a try using simple vegetal coal.
plain grilling charcoal works well.. just don't use the easy lighting kind.. to control odors inside cars and closets in damp climates
Thanks for the info, I8nite. I bought 2 kg of the activated carbon, but before making the filter I have to finish a hinged bracket for LCD TV. <br><br>I will try plain charcoal too.
Thanks -<br><br>I used the granular type so that it filled the PVC tube nicely.<br><br>Bill
I bought 2 kg of that activated carbon (approx 6 dollars/Kg), but before making the water filter I have to finish a hinged bracket for LCD TV.
Voted and Favorit-ed!
Thanks much, Blue!<br>Bill

About This Instructable


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Bio: I'm a retired mechanical engineer, woodworker, boater, and inventor.
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