The sponge is actually impregnated with the Rowaphos. They can be cut and implemented into just about any filter you can think of that you can fit a sponge in. Great idea actually!
Hmmm, I really like this idea. Can you tell me how many gallons each sponge is rated for? Is there something like 125ml of Rowa=1ea 4" sponge? Do you know the useful life of these, is it close to 3 months like the GFO product they offer?
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