DIY Mini Canister Filter - The Planted Tank Forum
 
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post #1 of 3 (permalink) Old 07-24-2006, 04:49 AM Thread Starter
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DIY Mini Canister Filter

This filter is for my 5.5 gallon cherry shrimp tank that I recently set up. Cost wasn't so much an issue, and I like to keep myself busy, so this project was great.

I used 4" PVC fittings for the main canister body:

1 threaded clean-up cap, which I drilled two holes into: one for the filter output, and one for the power-head electrical cord:



Next I glued in a 1/2" threaded to 3/8" elbow barb for the output:



then i spliced the powerhead cord and ran it through the second hole:



then, clamped the powerhead output to the threaded end of the hose barb with some 1/2" vinyl and some worm clamps:



The powerhead is a henri studios ps2 that my girlfriend had laying around from an old project. it's supposed to pump about 80 gph, but with 8" of head and the frictional resistance of the tubing length, coupled with the flow restriction from the bio media and intake sponge, i estimate the true flow to be only half of this. Once the powerhead, cord and barb were all positioned nicely I put a generous layer of epoxy over both sides of the holes i drilled. Then I taped the electrical cord back together and let it set.

Next I had to figure out what to do with the rest of the canister body. In the original design I had an endcap drilled and tapped by my girlfriend's dad so i could screw in a 3/8" inch barb:


Then I tried to drill a hole for the heater, but not taking into consideration the shortness of the canister body, I cracked the heater tube when screwing the whole assembly together. The powerhead rotated with the thread direction, and crushed the heater as I assembled it. Thus I had a nice, tapped end cap, with a gaping 1/2" hole, and no heater. I then realized that I should probably make the intake diameter larger than the output, and scrapped the whole endcap idea.

Last edited by nellis; 07-30-2006 at 10:54 PM.
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post #2 of 3 (permalink) Old 07-30-2006, 10:53 PM Thread Starter
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I forgot to take photos during the second half of construction, so post-install shots will have to do.



the clean-up cap (bottom-most piece) was threaded with teflon tape and screwed into a threaded-to-male 4" fitting (ribbed bottom piece). This fitting was then glued to a 4" bushing (top piece)



a 4" to 2" reducing bushing was then glued in to the top, and then a 2" to 1/2" threaded reducing bushing was glued in. I used a 1/2" barb, some 1/2" vinyl and some worm clamps to connect to the acrylic lilly intake pipe I made.
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post #3 of 3 (permalink) Old 07-30-2006, 11:01 PM Thread Starter
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I filled the canister body with Biomax rings, and ran it in a bucket filled with used, water-change water for about a week. This was half to flush out any pvc-cement vapors and half to innoculate with the rings with bacteria.



The output runs from the clean-up cap on the bottom, to the far side of the tank, where it meets another acrylic lilly. the output is used to spray co2 mist coming from a nano-reactor. The intake has a piece of cut sponge covering it.
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