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  1. G

    Super simple 5 minute sponge filter

    Hi im new to sponge filters and um i have a few questions. 1. You said put the gravel OUTSIDE of the hose, if the air pump is going down the hose what is the gravel there for? or did you mean Inside? 2. I dont get it when you mean put the air pump inside the hose then put it in the container...
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