2 spong filters - one pump?

[Gulfstream]

Hi, I have a 20 gallon tank with a sponge filter, powered with a whisper 20 airpump. My question is could I add a second sponge filter and run the same pump?

 

[jetajockey]

maybe, if the air pump puts out enough pressure. You'll need a Tee and an air adjuster to balance the flow between the two.

 

[Slade]

I have 8 sponge filters attached to a whisper 60. Depends on a lot of things - length of airhose, depth of tanks, location of pump. I keep my pump above tanks and take a chance by not using a check valve. If your pump is below the water line, you need a check valve. Any airstones you use will need a lot more pressure. Best advice is to try it and see if it works for you.