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Old 10-20-2014, 01:46 PM   #11
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here is the basic principle involved.
I'm sure you can use your imagination to use materials on hand and to suit your particular needs.

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Old 10-20-2014, 01:49 PM   #12
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considering the small size you could just as easily use an undergravel filter for goldfish bowls, then it would be completely unobtrusive.
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Old 10-20-2014, 01:57 PM   #13
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considering the small size you could just as easily use an undergravel filter for goldfish bowls, then it would be completely unobtrusive.
and probably quieter.
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Old 10-23-2014, 06:59 PM   #14
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So it should work? Does the airline to stay under water too or should it be above water?

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Old 10-23-2014, 11:13 PM   #15
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I needed to make a filter for an upcoming snail tank.. it's a 6.5g mini-bow.

Here's what I did:

(The tube was an old container for api test strips)

I had no idea what I was doing... But it looks like its working, the bubbles are going up through the tube so I hope it'll work.

The biomedia is seeded from my main tank
The 'filter pads' is wrapped around the bottom and outside bottom of the tube, as I didn't have a sponge..

Holes are drilled on the bottom and sides at the very bottom

It's about 6 inches tall 3/4" or so diameter.

(took me 30 seconds in paint, I know it's crap :P )



and here's a pic:
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Old 10-23-2014, 11:35 PM   #16
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How to make a sponge filter and pump Q?

Quote:
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So it should work? Does the airline to stay under water too or should it be above water?

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It's working great.. not much water flow, mostly air going up through the small airline, but enough flow for a shrimp tank (and it also should be great for bio-filtration.

If you mean the outlet, no it doesn't have to be below water, but you'll want it underwater. It gurgles and spits and will be even noisier above water than it already is. I should warn that it is quite noisy. I don't mind since it's just a breeding tank in the basement. If I was making something for a display tank, I'd use a larger diameter lift tube. Vinyl tubing that fits over the threads on the mouth of the bottle would be able to handle the stream of bubbles without gurgling. Then you'd have to run the airline through the side of the bottle and connect the airstone, or even just drop it down through the tube.

Edited to add:
You may have noticed that some sponge filters are designed with a right angle turn at the top of the lift tube. The idea is to pull more water through since the water will hit the top and swirl outward with the stream of bubbles.


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