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

Good

always a good product

Excellent item

Maintains my crystal clear 55 gallon tank.

Fits my model and works well.

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.

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!

They fit my Fluval U2 filter and and arrived in a timely matter.

upgraded to this from bio balls, this works much better for bacteria

It comes already in a mesh bag, so that is nice. I was worried I would have had to go out an buy one, but it comes included. There are nice and porous. Good for my aquarium