Fluval Aquarium Underwater Filter

I’ve had the Fluval U4, for two months now, and I couldn’t be more pleased with it. I used to have an ExoTerra external filter system, and it was awful! I couldn’t ever keep the tank from clouding up and turning green-brown in the first week after cleaning the tank... and that’s even with added turtle-safe chemicals. But now, as long as I clean out the extra food Grover doesn’t eat, the tank stays clear for weeks! My son drains the tank with a hose, every other week, and the water is still clear... a little yellow-green from Grover living in it, which is normal, but hey, I can still see him swimming around in there!!! Another bonus?..... it’s so super easy to clean! 2-3 minutes, and you’re I’ve had the Fluval U4, for two months now, and I couldn’t be more pleased with it. I used to have an ExoTerra external filter system, and it was awful! I couldn’t ever keep the tank from clouding up and turning green-brown in the first week after cleaning the tank... and that’s even with added turtle-safe chemicals. But now, as long as I clean out the extra food Grover doesn’t eat, the tank stays clear for weeks! My son drains the tank with a hose, every other week, and the water is still clear... a little yellow-green from Grover living in it, which is normal, but hey, I can still see him swimming around in there!!! Another bonus?..... it’s so super easy to clean! 2-3 minutes, and you’re done! Best turtle-filter purchase ever!! … more

I bought this for my turtle tank, after having the same brand for years and it just quit working. So I purchased another. It is absolute garbage. I have completely emptied my tank and put fresh water in it numerous times and within 3 days the water is brown and dirty. Would not recommend at all.

I was EXTREMELY frustrated with the directions to put the thing together! I spent a VERY long time and had to walk away several times. I had a Fluval that I really liked and this is no replacement.

I had this filter for 7 months before it died. I was working great. I really wish it would last longer. It was really easy to take care of and clean.

This filter has a very loud motor that rattles unless it is held horizontal with the vents where the water comes out facing downward. I don't know if it's just a dud, but I would like to return it, yet I see no place on chewy to return an item. Help me out Chewy?

This filter is disappointing and doesn’t work that well. Now it’s not returnable because it’s been used in a tank. Not worth the money.

We have had this type filter for 7 years and the turtle finally broke it up. I could not find them at our regular store any longer and was getting upset. This has been the only filter we have been able to keep for awhile without it getting broken into pieces. The turtle is very rough with everything we try. Since we found the Fluval Underwater, it has lasted for us. While trying to find a replacement, the Chewy page came up with the exact one we were looking for. They have all the filters and ceramic stones we need, and every bit of it is less expensive than we have been paying. Plus now, we do not have to drive 40 minutes to get the parts. Every Chewy order has arrived in record time! I love We have had this type filter for 7 years and the turtle finally broke it up. I could not find them at our regular store any longer and was getting upset. This has been the only filter we have been able to keep for awhile without it getting broken into pieces. The turtle is very rough with everything we try. Since we found the Fluval Underwater, it has lasted for us. While trying to find a replacement, the Chewy page came up with the exact one we were looking for. They have all the filters and ceramic stones we need, and every bit of it is less expensive than we have been paying. Plus now, we do not have to drive 40 minutes to get the parts. Every Chewy order has arrived in record time! I love Chewy!! … more

This filter started off great. It was very quiet and it cleaned my tank very well. It’s been about two months since I’ve purchased this filter and I’ve had nothing but issues for the last few weeks with it. It keeps sounding like it is clogged so I’ll take it apart and I clean it, and then a few hours later it sounds like it’s clogging again. I am very disappointed with this filter because it’s only two months old so it should not be having issues like this. Now my tank is filthy and I have to buy a new filter that will work properly.

MY NEW FILTER IS GREAT THANK YOU BUT EVEN BETTER IS THE PEOPLE AT CHEWY AND THE GREAT CUSTOMER SERVICE KEEP UP THE GOOD WORK GUYS I HIGHLY RECOMMEND CHEWY!

Put it in the tank around the start of October - did not make it to December. Opened it up and couldn't find anything wrong with it-it just stopped working one day.