Step 4: Testing

Before installing your new filter in your aquarium you might want to test it in a Jar full of water. You will see the water coming out of the Tube.

lukeD1 year ago
is it possible to make such an air punp yourself?
aabayoe3 years ago
Mission accomplished..! i already make it, now i dont have to buy expensive water pump anymore for my second tank...thanks
guyquiengco3 years ago
This is great! I just bought a filter and it seems too big for our aquarium. I'm gonna hack a filter using your instructible.