Looking for pre filter ideas for my trickle filters which consist of two 5 gallon buckets with bio balls and drip plates over the bio balls.Im currently using poly-fil over my drip trays. I use a lot of it and I feel its not only mechanical filtration but bio filtration as well. When I change it out I feel it has a impact on my biological filtration. If I had something I could rinse and reuse with tank water that would be best.Anyone using any type of foam over a drip tray? Maybe similar to the rinsable foam that's in the aquaclear filter? Someting I can cut to size?