Fluval U Underwater Filter BioMax

We have a couple turtles and this has helped a lot. I keeps the water cleaner for longer, and keeps it from looking yellow.

Although the Biomax rings (designed for their canister filters) will fit in a U2, U3 and U4 these fit better but are otherwise the same. Since you should only change half at one time and you can rejuvenate the other half several times before replacing them this supply should last you a long time and at a reasonable price.

Although the U series are NOT silent as some claim they are extremely quiet so long as you have them deep enough to just cover the top of the unit. Otherwise noise will come out of any non-submerged portion of the filter. It's the usual humming noise. Once submerged only the Venturi (if used) will create any significant noise. You can also use a standard 1/4" hose in the Venturi and place the other end in a semi-enclose space to make it even more quiet but I'd add a valve (sold on Amazon.com) to avoid any possible back flow during a power failure or when turning it off and refilling the tank during a water change. It may back flow and siphon otherwise but since the tube rises out of the tank and well above the water line it's less likely to back flow unlike with siphon or pump since the contain water instead of air. However if you fill a tank too quickly it could create enough pressure to make ti rise just enough but only under with enough pressure from inflowing water. A simple valve will make it always safe to use a 1/4 inch air hose to supply the Venturi with air at any depth of placement.

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I got the new filter when my old one broke an was skeptical that this would work as well with more pads and biomax. Works well

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I got this for my Fluval U2 underwater filter, it works great. Will get again, overall happy with the item.

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I bought this for my Fluval Edge and although it is basically loose in the box I managed to figure out a way that works for me and my tank.

After rinsing it very well, before replacing the old biomax, I cut some white replacement filter foam that is way thinner than the original Fluval filter foams and fold it in there so its not loose in my grey plastic filter holder.

I can't put too much because there is limited space in the holder for everything the tank needs but I get enough in there that works out well.

I would recommend and buy it again.

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