--- product_id: 13425518 title: "Whisper Internal Filter 10 To 30 Gallons, For aquariums, In-Tank Filtration With Air Pump" brand: "tetra" price: "VT13420" currency: VUV in_stock: true reviews_count: 11 category: "Tetra" url: https://www.desertcart.vu/products/13425518-whisper-internal-filter-10-to-30-gallons-for-aquariums-in store_origin: VU region: Vanuatu --- # 125 GPH filtration flow Ultra-quiet in-tank motor Easy Bio-Bag cartridge swap Whisper Internal Filter 10 To 30 Gallons, For aquariums, In-Tank Filtration With Air Pump **Brand:** tetra **Price:** VT13420 **Availability:** βœ… In Stock ## Summary > πŸ’§ Keep your tank crystal clear and your space noise-free with Tetra Whisper! ## Quick Answers - **What is this?** Whisper Internal Filter 10 To 30 Gallons, For aquariums, In-Tank Filtration With Air Pump by tetra - **How much does it cost?** VT13420 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/13425518-whisper-internal-filter-10-to-30-gallons-for-aquariums-in) ## Best For - tetra enthusiasts ## Why This Product - Trusted tetra brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Space-Savvy Design:** Mounts inside tank allowing flush placement against wallsβ€”sleek and discreet. - β€’ **Powerful 125 GPH Flow:** Effortlessly filters and oxygenates up to 30 gallons, keeping your tank pristine. - β€’ **Effortless Maintenance:** Large, easy-to-change Bio-Bag cartridges make upkeep a breeze. - β€’ **Whisper-Quiet Operation:** Submerged motor minimizes noise for a peaceful aquatic vibe. - β€’ **Dual-Sided Mesh Filtration:** Captures debris and fish waste efficiently with dense, dual-layer filtering. ## Overview 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. ## Description For the ultimate in convenience and quiet, choose a Whisper In-Tank Filter. These filters mount on the inside of the aquarium, rather than hanging from the outside -- making it possible to place the tank flush against a wall. In-Tank Filters are unusually quiet, since the motor is under the water. Offering the same quality and performance as an external filter, the Whisper In-Tank Filter will function in as little as 2 inches of water -- making it ideal for turtle tanks, or for creating a waterfall inside the tank.The Whisper In-Tank filter features adjusts easily to high or low water levels with mounting suction cups and/or bracket. Each filter comes with one pre-assembled Whisper Bio-Bag filter cartridge. Review: 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. Review: 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 ## Features - UNIVERSAL DESIGN: Tetra Whisper 20i Internal Filter is an all-in-one air pump and water filter system. - INTERNAL FILTER: Mounts on the inside of your aquarium with clip (included). - CATCHES DEBRIS: Dense, dual-sided mesh filters debris and fish waste. - AERATES WATER: Air-driven design filters up to 125 GPH while oxygenating water. - CONVENIENT DESIGN: Uses large easy to change Bio-Bag cartridges; filter mounts inside aquarium, making it possible to place tank flush against the wall. ## Technical Specifications | Specification | Value | |---------------|-------| | 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 | ## Product Details - **Brand:** Tetra - **Global Trade Identification Number:** 00046798258179 - **Included Components:** Aquaria 75025817: Tetra Whisper 20I Internal Filter - **Item Weight:** 1.45 Pounds - **Manufacturer:** Tetra - **Material:** 100% Polyester - **Model Name:** Whisper Internal Filter - **UPC:** 046798258179 ## Images ![Whisper Internal Filter 10 To 30 Gallons, For aquariums, In-Tank Filtration With Air Pump - Image 1](https://m.media-amazon.com/images/I/81g1VKwt4dL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: What size replacement filter cartridge for this unit...small, med?** A: The Tetra Bio-Bag Large (formerly known as Regular) are the exact same as the filter bag supplied with the Tetra Whisper In-Tank filter 20i. I got both from Amazon: filter $11.89; 12 cartridges $12.28. These filters last a long time, can be cleaned and reused. For my purpose, this filter has been great. **Q: Where can I just get the Bioscrubber?** A: Hello. You can get it at a pet store, amazon has some, grocery stores with a pet section...they are pretty easy to find. **Q: Would a small fish get sucked up in this filter? I have a 2 month old beta who is just recently getting color fins but still very small** A: Yes. I had 4 neon tetras and all 4 ended up getting sucked into the filter and the spinning fan mechanism blended them into multiple pieces. It happened the first night, I woke up and 4 fish were missing. I found them in the filter :( **Q: Would this filter be too strong for a Betta in a 10 gallon tank?** A: Yes, it would be fine. It is rated at 90 GPH which is the appropriate flow rate for a 10 gallon tank. Bettas are not the strongest swimmers, it is true, but typically handle filtration fine, as long as it is placed at one end of the tank so they have room to move away if necessary. They eventually adapt and will often play in the flowing water. Initially, you might want to place tall plants or tall dΓ©cor in front of it to break up the flow until the betta becomes accustomed to it. For additional assistance, please call the Tetra Consumer Relations Team at 1-800-526-0650. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Love, Love This Filter! *by T***R on September 29, 2023* 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. ### ⭐⭐⭐⭐⭐ I love these. Still going strong after 5 years. Bigger one and smaller one *by D***T on December 19, 2025* 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 ### ⭐⭐⭐⭐⭐ Works perfectly – great quality *by C***A on February 10, 2026* 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. ## Frequently Bought Together - Tetra Whisper Internal Filter 10 To 30 Gallons, For aquariums, In-Tank Filtration With Air Pump - API TAP WATER CONDITIONER Aquarium Water Conditioner 16-Ounce Bottle - Tetra Whisper Easy to Use Air Pump for Aquariums (Non-UL) --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.vu/products/13425518-whisper-internal-filter-10-to-30-gallons-for-aquariums-in](https://www.desertcart.vu/products/13425518-whisper-internal-filter-10-to-30-gallons-for-aquariums-in) --- *Product available on Desertcart Vanuatu* *Store origin: VU* *Last updated: 2026-05-07*