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DIY Aquarium air filter

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Published on Jul 22, 2012

Step 1: cut bottle in half
2: Puncture a lot of holes in the bottom, make sure the bottom part can't hold water for more then 3 seconds.
3: Put the connected air stone at the bottom, and fill it up with a filter medium like gravel.
4: Slide the upper half of the bottle over the bottom part, and it's ready to go!

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