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

Buen producto

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

Biological filtering is the way to go. One of the best aspects of the Underwater U series is that they approach water cleanliness through a comprehensive approach, including BioMax. These little white nuggets work like magic for the water of my turtle tank.

This is just what my turtles filter needed to keep his aquarium cleaner for longer and safer for his health

Product as described. Good price.

Bio Max works.

Fits my model and works well.

The Fluval U4 does not include enough ceramic media, so its a good idea to pick up some extra if you buy one. One box is more than enough to fill up the cartridge and seems like its better quality than what came with mine even though its the same brand. The ceramic media comes in a net/ mesh baggie which has to be cut open to use it in the U4, or can be used whole in other types of filters. Its nice media, its porous and the pieces are just about the perfect size and shape for medium sized filters, Ive used it in several different filters now both loose and still bagged.

Maintains my crystal clear 55 gallon tank.

We use this in our Fluval U2 Filter for our turtle. In combination with the other filter refills, it keeps the turtle clean nice for an extended period of time.