Filter foam - The Planted Tank Forum
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post #1 of 12 (permalink) Old 10-09-2019, 12:06 AM Thread Starter
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Filter foam

Hello again! Today I'm trying to track down foam to use as a prefilter. I'm building a siphon for a breeder tank and I'd like to keep shrimplets and fry from getting sucked up. Does anybody have a recommendation?
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post #2 of 12 (permalink) Old 10-09-2019, 01:02 AM
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There are a lot of options. Go to amazon, type pre-filter foam and you will find a LOT of options. You should pick one based on the size of the hole you are looking to plug/pipe to cover.
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post #3 of 12 (permalink) Old 10-09-2019, 02:01 AM Thread Starter
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Originally Posted by minorhero View Post
There are a lot of options. Go to amazon, type pre-filter foam and you will find a LOT of options. You should pick one based on the size of the hole you are looking to plug/pipe to cover.
I've looked around, and most are made for specific filters, and many don't have dimensions listed. I'm looking for something for 2" PVC, OD 2.375". Poret has a 10 PPI foam block at 4" diameter, and it looks like that's my best bet, but it's $50. I'm searching for a cheaper alternative.
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post #4 of 12 (permalink) Old 10-09-2019, 03:01 AM
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Thats a pretty big pipe to fit over.

You may possibly find some pond pump pre filters that will fit however they usually have a pretty big pore size foam and very new babies can find there way thru it. Your best bet is either buy a block of foam and cut a X or O thru the center of it. This would be the easiest way to go.

Or use a sheet of foam of your choosing, wrap around a piece of spare 2"OD PVC cut to size and glue the edges (silicone would probably work). Once dry you have your pre filter.


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post #5 of 12 (permalink) Old 10-09-2019, 03:18 AM
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Get some small pore Poret foam and cut a square bigger than the pipe . Put it over the end leaving space between the end of the pipe and the foam and rubber band it around pipe . Hope that makes sense....lol

My wife says if I get one more aquarium she is going to leave me . I sure am going to miss her fried chicken .
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post #6 of 12 (permalink) Old 10-09-2019, 07:16 AM Thread Starter
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Originally Posted by Leeatl View Post
Get some small pore Poret foam and cut a square bigger than the pipe . Put it over the end leaving space between the end of the pipe and the foam and rubber band it around pipe . Hope that makes sense....lol
Is the 10 ppi too coarse? I was looking at their website earlier. I'd like the flow to be uninterrupted but also safe.
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post #7 of 12 (permalink) Old 10-10-2019, 01:30 AM
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I have been thinking about what I suggested yesterday and it may not work like I think . I have been playing around with some Poret I have and it doesn't want to fit around a pipe without a lot of excess around it . I think you might be able to trim it to fit better , but I don't want to cut mine to see .I still would try to use the Poret somehow and I would use the 20 or 30 . You can get a 13x13 inch piece for $4.00 plus shipping .

My wife says if I get one more aquarium she is going to leave me . I sure am going to miss her fried chicken .
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post #8 of 12 (permalink) Old 10-10-2019, 05:09 AM
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Why are you using such a big pipe size?
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post #9 of 12 (permalink) Old 10-10-2019, 02:28 PM
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Go to Amazon and search for "Matten Filter". You will find a wider, cheaper, variety of foam pads you can use for your setup. Just have to get a little creative on how to attach it to your siphon pipe.
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post #10 of 12 (permalink) Old 10-10-2019, 04:41 PM
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I find the Aquaclear brand foam to have lots of good points and it is very handy for me to buy locally to avoid shipping. Two inch may press the sizing but I would look for one and tunnel out a space to fit over the pipe. Not a big fan of shopping to dropping on the cheap stuff I can get locally. The pore size of their media just right for me.
Perhaps consider wedding veil netting as a very cheap and handy option as it is normally fine enough but not stop up too quickly. A dollar gets you a ton of netting.
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post #11 of 12 (permalink) Old 10-16-2019, 06:00 PM
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I 2nd the Aquaclear foam. It's what I use on my guppy/QT tank to keep the fry safe. This is after a week in.

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post #12 of 12 (permalink) Old 10-16-2019, 11:14 PM
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+1 on Aquaclear foam. The 70s or the 3x50s (with one sideways) fit perfectly in my Deep Blue tanks with Betta dividers.

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