if it just acts as a "blocker" for debri, and isn't your main source of beneficial bacteria, you could use some filter floss.
but after also reading over their web-site, I think you're going to want to pick them up, depending on what you say you lost...
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The first stage of the AQUA-Tech® filtration is mechanical. The blue polyfiber pad that is integrated onto the EZ-ChangeTM Filter Cartridge screens out dirt and debris as water passes through.
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If this is what you lost...filter floss can replace this, as I said this is the stuff that just acts as a 'blocker'
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The second stage of the AQUA-Tech® filtration is chemical. The activated carbon that is in the EZ-ChangeTM Filter Cartridge removes dissolved waste and cleans the water of odors.
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I'm guessing that those black "screen things" was where activated carbon went. Carbon is not necessary, as it usually dies off after a few weeks anyways, and if this is a planted tank, it's definetly not wanted.
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The third stage of the AQUA-Tech® filtration is biological. The BIO-Fiber that is included in each AQUA-Tech® Power Filter provides additional surface area for beneficial bacteria to grow and thrive. The bacteria then eliminate toxic ammonia and nitrites that can be fatal to fish. You should never clean or throw away the BIO-Fiber. If the BIO-Fiber becomes too clogged, rinse it with conditioned water only.
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If this is what you lost, you're going to need to pick some up. This is the main component of your "beneficial bacteria" it will seed and grow on here. If you lost this, I would look for a replacement.