The Aqua One sponge pads for the Advance 550 and Advance 750 canister filter trap solids and provide a home for filtration bacteria.
◾ Large surface area for bacterial attachment
◾ Finer pore size traps more solids
◾ Need cleaning more regularly
◾ Change every 6 months to maintain performance
Why you should replace your Black Foam (402s) every 6 months
Aqua One's black filter foam serves a very specific purpose in your canister filter. It is situated in the top tray of the filter and is much finer than the media that precede it. The smaller pore size means that finer particles of waste are trapped where they can be broken down by a large culture of friendly bacteria. The coarser media below trap the larger solids so the black pad doesn't become easily choked and can deal with even tiny 'bits' leaving your set up with a very clear, healthy look.
The fine, black, foam pores do compress over time and can reduce the overall filter flow rate so do change the black foam pad in your canister filter every six months or so with a regular, monthly rinse out in aquarium water in between to keep it working well.
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