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

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.Read full review...

Verified purchase:  Yes | Condition: new | Sold by: afarawaygalaxy

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.Read full review...

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 STARSRead full review...

Verified purchase:  Yes | Condition: new | Sold by: vd2660

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.Read full review...

Verified purchase:  Yes | Condition: new | Sold by: mightygalaxy

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.Read full review...

Verified purchase:  Yes | Condition: new | Sold by: bonigo-83

The best filter I have used

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.Read full review...

Verified purchase:  Yes | Condition: new | Sold by: buy_and_smile

Love these filters

I love that these filters are easy to use,quiet,reliable,and yer the filters do need changed every few weeks,but the bioscrubber that comes with it does not get rinsed off and holds the good bacteria and putting in a clean filter pad when needed keeps water clear always. Nice easy water flow easy on the fishRead full review...

Verified purchase:  Yes | Condition: new | Sold by: householdgoodss...

Tetra whisper in tank filter

I am completely happy with this product. Using it in a 40 gallon turtle tank inhabited by 3 mud turtles. The filter is doing a fabulous job and the bioscrubber system clearly makes a huge difference as the previous tetra whisper I was using without the bioscrubber often left the water a little "murky".Read full review...

Verified purchase:  Yes | Condition: new | Sold by: mightygalaxy

Great but needs ssome improvement on design

It really does keep the water clean for my turtles...But I am using it for a 10 gal tank.... The hanger needs some work tho… It came broken... and there is no way to turn the flow down..... But I love how it keeps the tank clean.....Read full review...

Verified purchase:  Yes | Condition: new | Sold by: mytaterdog

Great filter!

This filter has lots of power and I have high hopes for it. I bought it for my turtle that makes the water filthy when she eats veggies. Other filters I've purchased had weak pumps from the start and died in about a month's time.Read full review...

Verified purchase:  Yes | Condition: new | Sold by: mlatrends

Good filter

This is a great filter does a good job keeping the tank clean. Unfortunately the adjustment strap/hanger does not lock on sturdy enough and it falls off then sinks to the bottom. If left alone it's fine but if you have agitater like my Snapping turtle you will have to resecure it with zip ties. Then it's perfect!Read full review...

Verified purchase:  Yes | Condition: new | Sold by: renleys