

💧 Keep your tank crystal clear and your space noise-free with Tetra Whisper!
The Tetra Whisper Internal Filter is a compact, in-tank filtration system designed for aquariums between 10 to 30 gallons. Featuring a quiet submerged motor, it delivers up to 125 gallons per hour of filtered and oxygenated water. Its dual-sided mesh and easy-to-replace Bio-Bag cartridges ensure efficient debris removal, while the internal mounting allows tanks to sit flush against walls, blending performance with sleek convenience.

| ASIN | B0002DHYG8 |
| ASIN | B0002DHYG8 |
| Batteries | Product Specific batteries required. |
| Best Sellers Rank | #1,549 in Pet Supplies ( See Top 100 in Pet Supplies ) #3 in Aquarium Filters |
| Brand Name | Tetra |
| Customer Reviews | 4.2 4.2 out of 5 stars (22,197) |
| Date First Available | June 9, 2004 |
| Department | Unisex-Adult |
| Global Trade Identification Number | 00046798258179 |
| Included Components | Aquaria 75025817: Tetra Whisper 20I Internal Filter |
| Is Discontinued By Manufacturer | No |
| Item Type Name | Aquarium Filter |
| Item Weight | 1.45 Pounds |
| Item model number | 25817 |
| Manufacturer | Tetra |
| Manufacturer | Tetra |
| Material Type | 100% Polyester |
| Model Name | Whisper Internal Filter |
| Model Number | 25817 |
| Product Dimensions | 4.88 x 5.38 x 10.19 inches; 1.45 Pounds |
| UPC | 046798258179 |
| Unit Count | 1 Count |
| Warranty Description | See label |
T**R
Love, Love This Filter!
Okay so... I have a 20 gallon temporarily for my 4 inch turtle. I accidentally bought the smallest of this tetra filter, so I bought the medium sized one in it's place. I had only had the tank filled halfway anyway since my turtle was only 1.5 inches at this point. Mind you I didn't realize how fast they grow, and had no idea that Its recommended to have a filter that can filter 2 to 3x the tank size. So I decided to keep both filters in my tank. One on each side. Even though I still don't reach the recommended filter size, my water now almost filled to the top, stays absolutely clean. Turtles are pretty messy so I still have to do the weekly cleanings and all that extra stuff that apparently those who spend hundreds of dollars on filters still have to do as well. I don't know if this is some kind of luck thing, I don't know if maybe my turtle just isn't that dirty (yea right, I see him)... but I'm actually not looking forward to switching out my filter for the 'recommended' filter size, as these filters work so good. I love them. They are both very quiet. Aside from the sound of the water falling back in.. I mean it sounds like a waterfall. Who doesn't want to hear a waterfall? I love it. This can also be prevented by raising the water level or lowering the filter itself. Basically the closer it is to the water, the quieter it is. Such a simple device, yet so beautifully sufficient. The little one stopped working at one point and I thought... welp there you go! Get what you pay for. But nope! Removed the base, pulled out the magnetic spring propeller and tube, cleaned it out and like magic it started right up as soon as I plugged it back in. Love how easy it is to replace the filters. The filters themselves are great and definitely hold on to some dirtiness. One thing I'll say is there is quite a bit of unused empty space. I now take advantage by adding some extra media, but I must say that these filters work great even without the extra. Love this filter and would recommend above any other filter.
D**T
I love these. Still going strong after 5 years. Bigger one and smaller one
I have used these for so many years for little tank setups and my turtle and snails etc. Always work super great and super quiet! Plus they are cheap. No brainer imo. I'm sure theres a faulty one here n there as with anything but keep the propeller clean like any other pump and dont let the filters get too overflowing clogged and you'll be happy I promise. Also with filters of any kind try to get one rated for more than you actually have so the filter doesn't get overwhelmed. Even the filters are cheap for a box of 12 for like $13. Cant go wrong!! 10/10
C**A
Works perfectly – great quality
This product works perfectly and does exactly what it’s supposed to do. My aquarium looks cleaner and healthier, and everything runs smoothly. Great quality, easy to use, and worth every dollar.
L**D
Worked well- for 6 mo 🫤
Lasted 5 months- then just stopped working! 2nd time I’m purchasing this. 1st lasted about ) mi- but super quiet anc seems to filter well
L**T
!!PLEASE READ!! DO NOT BUY FOR SMALL FISH
I recently set my smaller fish tank back up to put some fish out of my main tank into (tank full of guppies and a couple algae eaters) as one of the “algae eaters” has begun to jump through the water and swallow my guppies whole. I had the filter left over from a goldfish I had for a few years in there and figured it would be fine. When i moved the fish into said smaller tank i moved six over and then a smaller one ended up popping up (making it seven fish) i went to sleep and all were fine. When i woke up i noticed one of the fish i had put in there had died, the next day (today) FOUR MORE were missing when i woke up. Two had gotten tangled in a fake plant and died (i figured it was fault for putting it in with the guppies) i then watched one of two remaining fish be blown into said plant by this filter as i was investigating. I saved that fish but it was somewhat weak (i was actively treating the tank for ick) so i let it be. i CAME BACK ABOUT FIFTEEN MINUTES LATER TO ONE FISH. i figured it had went into the little structure i have in my tank, it had in-fact not. Instead i found it another fifteen minutes later when i saw something peeking out of the bottom of my filtration system. It was the tail of A DIFFERENT FISH that i figured had passed in the fake weeds. Upon seeing this i pulled the filter and was appalled to see MY LAST FEW FISH I COULDNT FIND HAD BEEN EATEN BY THE FILTER. Two of them were dead- i then had a half paralyzed fish that died about 30 mins later. Ive now unplugged the filter with ONE OF SEVEN FISH LEFT AFTER A DAY AND A HALF OF USE. I Strongly advise against getting this filter if you have guppies as it may cause a quite disturbing scene. ALTHOUGH this filter killed a bunch of my guppies (literally sucks so hard it ate them) it WORKED GREAT FOR MY FULLY GROWN GOLDFISH for about a year before he passed so that is something to take into account. Personally i think it should be advertised that this filter CANNOT HANDLE SMALL FISH NO MATTER THE TANK SIZE.
J**N
Helps clean my Tank Well
A great filter to use. Easy to use and assemble. Great for cleaning mym tank and the design is nice.
J**S
Silencioso y mantiene la pecera limpia
D**N
للاسف المنتج 110 فولت ولايوجد في الوصف تحديد للجهاز،وعندنا في السعودية 220 فولت فقط،بالاضافة الى ان غطاء الفلتر غير ثابت،لابد من ارجاع المنتج
P**.
Los pocos días que lleva en uso a sido 100% efectivo, limpio el agua de mi pecera a pesar que ya estaba un poco sucia. Súper silencioso y de buen tamaño Hasta ahora todo bien
R**X
Works great, no noise and tank is cleaner.
S**T
Plugged it in and it was dead. Waste of time and money, spend it elsewhere. Now I’m left with extra filters that I purchased and a dead pump/filter. Not happy Jan.
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