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Old 04-24-2006, 06:55 PM   #1
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DIY Sponge Filter...

I made a DIY sponge filter for my hospital/fry tank.

All you need is some PVC pipe, fittings, and cement, a large car wash sponge, an air pimp, and some airline. I also used a thermometer holder to prevent it it from floating. Others have used something to weigh it down, but I find the suction cup method to work just as well. Airstone is optional...I decided to use an airline shoved down the tube...


Here is everything you need (minus the airpump and airline):


PVC cement:


I cut the sponge in half and drilled a hole for for the PVC pipe:





Here is what the PVC pipe and fittings look like fully assembled (prior to glueing):


Completed sponge filter assembly...notice the hole drilled into the 45* piece for the airline:


Here it is in action:
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Old 04-24-2006, 07:07 PM   #2
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cool idea
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Old 04-25-2006, 04:26 PM   #3
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very nicely done. And since it's just a cheap everyday sponge you can throw it away after each QT for that added level of sterile comfort
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Old 05-18-2006, 02:41 AM   #4
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wow thats pretty cool!
So do you put the airline all the way into the tube, or just part of the way?
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Old 05-18-2006, 11:26 AM   #5
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I think I just found my filter set up for future black worm breeding tank Thank You.
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Old 05-21-2006, 08:58 AM   #6
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I put the airline down the tube, but it doesn't make the turn into the sponge area. Just deep enough to get the water moving in an upward direction...
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Old 05-21-2006, 12:12 PM   #7
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That's pretty cool. Great idea!
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Old 08-30-2007, 03:42 PM   #8
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I'm curious about drilling the sponge? How did you do that? Normal wood tools? Compress it first or not?
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Old 08-30-2007, 03:51 PM   #9
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What keeps the fry from swimming down the 45 on top? couldn't you just cap it and drill a hole for the tube? And would the water just take the path of least resistance and come in the top instead of the sponge?

Does look good though, I love DIY.
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Old 08-30-2007, 04:19 PM   #10
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Quote:
Originally Posted by spittinfly
What keeps the fry from swimming down the 45 on top?
Current. Just like any sponge filter. Anything strong enough to swim against that current isn't going to be hurt by it.
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