Works Great - Cheaper Alternative

These direct replacement cartridges work great, no question about it. However, there are cheaper alternatives... Take the filter media off of an old cartridge and keep the plastic piece. Purchase a bag of filter material (floss or other type) and cut to match the plastic. Just hold the two together and insert into your bio-wheel filter. The plastic keeps the filter material from sagging in the filter, and it doesn't need to be attached. If you want carbon, get a mesh bag and drop it in one of the media baskets within the filter. Little more work than the direct replacements, but a hugh cost savings. I can get about 20 filter replacements out of a $10 bag of filter floss.

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