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I'm considering removing all of the bio balls from my trickle filter and replacing them with Poret Foam from SwissTropicals. I emailed SwissTropicals, who suggested using 2x20ppi and 3x30ppi sheets, laying them flat (greater surface area). I've been searching and haven't found any pictures of a bioball tower filled with poret foam in this way. Has anyone done this? experiences? pics? Thanks.
 

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it is not exactly what you describe but my 180 Front tank has a 2" piece of the foam on top of a bed of bio balls. The inside dimensions of my sump chamber are 15"x15" the foam is flat, on top of about 6" of bio balls, supported by egg crate about 3" off the sump bottom.

Seems to work well for me. Love the foam.
 
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