Fluval U Underwater Filter BioMax, Replacement Aquarium Filter Media, A495

Works

Product arrived quickly and is as described. Saves money and time to buy these in bulk.

You can reuse these. Unlike other media, perfectly reusable. Just rinse off gunk

The Fluval U Undewater Filter BioMax works as expected with my Fluval U filters. This is the largest packaging of it that I have seen, so I always buy it here on Amazon because of the price versus getting it at the local fish store. I have Amazon Prime, so I get Free 2-day shipping and I dont have to pay for shipping on my orders which is very nice. If Fluval made these in a larger package volume, I would buy that. Make sure you only remove half your bio media when you clean or make changes in your filter so to make sure you maintain a decent established bacterial content in your tank to maintain a working cycle. Dont wash or clean under the tap, or the chlorinated water will kill off the good bacteria especially on the bio- media you are keeping in the filter. Rinse with tank water if necessary. I definitely recommend these for your Fluval U Underwater Filter. They are the BioMax media that you use with the filter. You can add other things as well into the cartridge chamber like carbon, zeo-carbon or ammonia removers if you need it. Fluval has them available for sale as well, and they are available on Amazon.

Just as described, perfectly happy with the purchase! And of course my RES is loving it even more!! :-)

Helps keep my fish tank water in perfect condition. Crystal clear water and healthy fish. Does what its supposed to. I wish it was a little cheaper.

Works great

Been using these in one Fluval filter for 2 turtles in about 50 gallons of water for the past 2 months and the water is still so very clear and healthy!

Works great with the Fluval filter and helps keep the water the cleanest. The filter keeps things cleaner longer with this product.

More of the same when it comes to the Fluval system parts.