When I first got into the hobby alot of people used these filters... Diy, simply a piece of foam, siliconed to a piece of tile and you use a pvc pipe thats perforated as a lift tube. I used to use them in all my tanks. Then hydrosponges became popular and I switched. The past year I made a bunch and use them in some tanks. Really a very easy and cheap filter. Just curious how many people still use some or remember using them!

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