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I've used a smaller one of these for several years. It does what it is suppose to, Keeps water clean. I use it in a natural tank. Sand rocks some minnows and a turtle. It has a good biological balance. This filter seems to keep it that way. It does have a pretty heavy load so it gets sludged up at times. I take it out and clean it, easy to do. Use the same filter for about a month. The 40i flows a good amount of water, but it hangs on one end of tank so the other end does get a little dirt build up. If you have a long tank/pond you might want a filter that the pump can be on the oppisit end of the discharge.
Verified purchase: Yes | Condition: New
I actually didn't have high hopes in this filter for my aquatic turtles, but I plugged it in and had the entire tank clear in less than an hour!! It's quiet, the turtles are rather curious about it. It's not too strong I have to worry about their safety. 5 GIANT STARS
Verified purchase: Yes | Condition: New
I like the filter, seems to be doing very nicely. Water looks better. Some mentioned the filter is loud, but under water I barely hear it. They also said it looks big and bulky in the tank not a good visual. I like it that way cause I painted a cut piece of cardboard black for a background, and the filter matches nicely. Suttle and professional look.
Verified purchase: Yes | Condition: New
This is the second one I've bought in about 4 weeks. I needed a compact filter for 2 additional turtle tanks in 20 gallon long tanks. I tried several cheaper weaker in tank filters that either failed or were inadequate. So far I am satisfied. I bought additional filter bags for easy filter changes and added my own improvement by covering the bottom around with aqua flo polyester filter because I have some plants that tend to clog filters otherwise. When I see the excellent flow slow down a bit I know its time to clean the outside filter. If these last I'll be very satisfied. I have 3 canister filters working but sometimes you just don't have the room for a canister filter. Whisper 40i is a good value.
Verified purchase: Yes | Condition: New
I’ve had aquariums for 50 years. This is a very efficient low maintenance filter. It’s extremely easy to service. Replacement filter media are available and inexpensive. They do a good job of airation also, and create current in the tank which is very beneficial to the fish.
Verified purchase: Yes | Condition: New
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