4 out of 5 stars
by big-drillerOct 02, 2018
Top favorable review
Does the job
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
3 out of 5 stars
by christopherdavi...Feb 17, 2018
Top critical review
It’s okay
Not what you would expect from the size. This says that it handles and keeps clean up to a 40 gallon tank Yeah right I beg to differ. Even with a filter change every two days this thing sucks. I have a 20 gallon tank and the water is horrendously murkey Which means that the filter won’t work for anything over ten gallons Even when you change the filter every two days.
Verified purchase: Yes | Condition: New
5 out of 5 stars
by red1179Sep 24, 2018
Turtle Tank Filter is AMAZING!
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
5 out of 5 stars
by jr042700Feb 03, 2016
Simple and Quiet
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
5 out of 5 stars
by quantproOct 12, 2018
Whisper 40i very good filter.
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

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Tétra Whisper 40i Internal Tank Power Filter with BioScrubber (25818)

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Does the job

It’s okay

Turtle Tank Filter is AMAZING!

Simple and Quiet

Whisper 40i very good filter.

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