How does a sponge filter work

[French Fry2]

I was wondering how a sponge filter works???I know it blows out air but how does the water get sucked up???Please help!!!

Also what do I need to make my own???:(

[slipknottin]

you pump air into it, and as the air rises it pulls water with it. The water is sucked through a sponge. Why would you want to make your own? They sell brand new for like $3.00

[French Fry2]

I just enjoy making them could you please tell me what I need for one!!!

[slipknottin]

I dont know where you would be able to get the stuff.

Unless you have a source for a round sponge, I suggest you just buy a ready-made one.

[French Fry2]

Yes I do have a round sponge:p

[fishman156]

Here is a website. sponge filter (http://www.petfish.net/sponge_filter.htm)
Try searching for "making a sponge filter" on yahoo, there is alot of sites.