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

Using with my U4 filter, which is working out great in my turtle tank

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

Once again, fluval has the best products for keeping your fish tank clean.

Needed it

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

Used these for my Fluval water filter in my aquatic turtles tank. Exact replacement and works great. Shipping was timely.

Ive always bought these, theyre great for clearing up the aquarium water.

I bought these for my turtle tank filter, works well.

The more I learn about filter the more I realize I was wasting money on these,

Thank you