--- product_id: 345333783 title: "Auto Top Off System, ATO System, Fish Tank Sump Water Filler Refiller, Automatic ATO System for Aquarium with Pump,Water replenishment system, DIGITEN Smart ato System for fish tank" brand: "senstree" price: "€ 126.83" currency: EUR in_stock: true reviews_count: 12 category: "Senstree" url: https://www.desertcart.be/products/345333783-auto-top-off-system-ato-system-fish-tank-sump-water store_origin: BE region: Belgium --- # 200L/H max flow rate Plug-and-play easy installation Dual float sensor for fail-safe control Auto Top Off System, ATO System, Fish Tank Sump Water Filler Refiller, Automatic ATO System for Aquarium with Pump,Water replenishment system, DIGITEN Smart ato System for fish tank **Brand:** senstree **Price:** € 126.83 **Availability:** ✅ In Stock ## Summary > 💧 Keep your aquarium flawless—automate, protect, and relax with SENSTREE’s smart ATO system! ## Quick Answers - **What is this?** Auto Top Off System, ATO System, Fish Tank Sump Water Filler Refiller, Automatic ATO System for Aquarium with Pump,Water replenishment system, DIGITEN Smart ato System for fish tank by senstree - **How much does it cost?** € 126.83 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/345333783-auto-top-off-system-ato-system-fish-tank-sump-water) ## Best For - senstree enthusiasts ## Why This Product - Trusted senstree brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Universal Compatibility:** Fits aquariums up to 16mm glass thickness and supports sump water levels up to 17cm for versatile use. - • **Whisper-Quiet Operation:** Ultra-quiet pump (<40db) keeps your aquatic environment peaceful and undisturbed. - • **Complete Plug-and-Play Kit:** Includes pump, power adapter, siphon break, and all accessories for hassle-free setup and long-term durability. - • **Precision Water Level Control:** Reliable relay control with backup float ensures your tank stays perfectly balanced, even if one sensor fails. - • **Effortless Aquarium Maintenance:** Smart dual float sensors automate water top-off, eliminating daily manual refills and preventing overflow. ## Overview The SENSTREE Auto Top Off System is a durable, easy-to-install aquarium water replenishment kit featuring a dual float sensor for fail-safe water level management. With a max flow rate of 200L/H and whisper-quiet operation, it fits tanks up to 16mm thick and prevents overflow with precision relay control. This all-in-one plug-and-play system includes a pump, power adapter, siphon break, and accessories, making it the ultimate solution for hassle-free aquarium maintenance and evaporation control. ## Description Product Description Aquarium Auto Top Off ATO System Say NO to the expensive ATO! The ATO system uses a double float water level switch (such as "two eyes") to double monitor and protect the fish tank water level. The controller integrates a relay and a stable circuit to protect the water pump and the water level switch more effectively. The mounting holder is very firm, which can freely adjust the water level up and down, and it will not cause the water level switch to misjudge, no matter the swimming fish, water plants, and so on. The whole system is very easy to install, saving a lot of tedious work for DIY. The stable system saves you from worrying about overflow when you go out! We believe you will fall in love with this ATO! Widiy Applications Integrated Design Without Setting Plug and play, easy operation. An anti-overflow protection design will automatically cut off power when the water level is too high. Double Protection An accurate dual-float water level sensor can provide over-filling protection. When the water level drops below the lowest water level, the power supply will be activated and the water pump will work automatically and shut down when the water level reaches the highest water level. When the first float fails, the second float will work. Dual float ball sensor cable length: 1m (3.28ft) Auto Top Off System Automatic ATO System for Aquarium with Pump Specifications Pump Material: PC+ABS Rated voltage: 12VDC Max power: 5W, Rated current: 0.5A Waterproof grade: IP68 Max lift: 0.4-1.5m Max flow rate: 200L/H Noises: < 40db Power adapter Input: 100-240VAC, Output: 12VDC, 1A Easy to install This smart auto top-off system is widely used in various aquariums, sumps, fish tanks, coral reef tanks, etc. Complete accessories Package includes 1 x Holder 1 x Dual Float Ball Sensor 1 x Pump 1 x Power Adapter 1 x Splitter Adapter Cable 1 x Silicone Hose 1 x Siphon Break 1 x Manual Silicone Hose Silicone hose length: 2.5m (8.2ft) Pump cord length: 1.4m (4.59ft) Power cord length: 1m (3.28ft) Splitter adapter cable length: 24cm (0.78ft) Review: Brilliant item! never lets me down. water sensor works, have adjusted to fit lidded tank - Looked at multiple auto top off systems and none of the others can be used with a jewel aquarium with a lid. they all seem to be designed to only work with open top tanks. Admittedly I had to butcher the tank attachment to make it fit, but it wasn’t too difficult using a small electric saw to cut off the extra top piece sticking up not needed..This would be the piece that would stop the lid shutting. Now it’s completely under the lid in the back slot place and out of sight. (the other option would be to butcher a slot out of the lid to make it fit) no other system on the market that I looked at had the slightest chance of working. This device is a game changer for me. I never have to top up my aquarium. I have a reservoir bin of approximately 45 L. The pump goes into this reservoir, is topped up from a hose pipe and is kept full ready for each water change, which is done by using a length of airline hose put out the window to drain the tank slowly. The pump just cuts in and out as needed and water changes can take as slow as you want without any bother which is brilliant for shrimp tanks! Keeping reservoir full ahead of time means water is always at room temperature and doesn’t take lots of power to heat. Also water condition is et cetera if needed are much better pre-mixed in the bin. If Reservoir accidentally empties completely without noticing, it’s not a problem as pump just switches off until you fill it again. With an airline control valve on the end of draining pipe you can control the flow then just set it and forget it and do other things for awhile even two or three hours :-) also great for us plant enthusiasts who are always nabbing a little bit of water here and there from the aquarium to water the plants… it just fills itself up again:-) I have to admit it does seem expensive for what it is when you look at it, however for those of us who struggle with tank maintenance, it’s a game changer and a lifesaver! for me it has been well worth the money. And as for noise level well you can’t really hear it at all. Only the actual noise of the water going in. For the perennial problem of the ever present aquarists acquisition disease, yes I would definitely buy this again.:-) oh and thanks to MD tanks for the inspiration Review: Reliable a year so far - It’s reliable, and has been in use for more than a year, when my previous purchases of 2 devices of other brands elsewhere online would already have stopped functioning. I could never work out why those stopped working. ## Features - 💧💧【Simple, Complete, Smart Automatic Top Off System】 aquarium automatic water supply system, super easy installation and maintenance. Suitable for aquariums up to 5/8"(16mm) thick, durable PC material holder to prevent move, adjustable bracket on holder make different water levels possible. - 💧💧【Relay Control】 precise dual float water level sensor for overfilling protection. When the water goes below the minimum water level , the power will be activated, the pump automatically works, and cut off once the water level reach to maximum. The second float ball will work when the first float ball fails. - 💧💧【Siphon Break】 The siphon break is optional installation part. It is recommended that the water level of display tank be higher than the reservoir, and DON’T leave the end of the water supply pipe in the water, otherwise, it will siphon after the pump shuts off, if so the siphon break must be installed at the end of the water supply pipe. - 💧💧【Plug-and-Play with all parts included】 Everything you need is included, it will also come with a pump and a ETL listed power adapter. Safely keep sump water levels stable, no moving parts that can fail. - 💧💧【Widely Used】Suitable for all kinds of fish tanks, aquariums, sumps, etc. The range of water level from aqurium sump top is 0-17cm or 0-6.7".Suitable for aquariums up to 5/8"(16mm) thick, save you a lot of time to enjoy your life. The Smart ATO Complete Kit will never make water overflow your tank, it is especially suitable for the sump with a lot of evaporation. 12 month warranty! ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B098X97T43 | | Best Sellers Rank | 50,403 in Pet Supplies ( See Top 100 in Pet Supplies ) 157 in Aquarium Water Pumps | | Brand | SENSTREE | | Brand Name | SENSTREE | | Colour | Black, White | | Country Of Origin | China | | Customer Reviews | 4.4 out of 5 stars 27 Reviews | | Included Components | Holder, Dual Float Ball Sensor, Pump, Power Adapter, Splitter Adapter Cable, Silicone Hose, Siphon Break, Manual | | Item Weight | 500 Grams | | Item weight | 500 Grams | | Manufacturer | SENSTREE | | Manufacturer Part Number | ZJ-ATO19-UK | | Material | silicone | | Material Type | silicone | | Model Number | ZJ-ATO19-UK | | Number of Items | 1 | | Number of Packs | 1 | | Pet Type | Fish | | Product Style | Protection | | Set Name | SENSTREE Auto Top Off System Complete Kit | | Special Features | Durable | | Special feature | Durable | | Specific Uses For Product | Indoor | | Specific uses for product | Indoor | | Style | Protection | | Target Species | Fish | | Unit Count | 1.00 count | | Vivarium Type | Aquarium | ## Product Details - **Brand:** SENSTREE - **Material:** silicone - **Special feature:** Durable - **Item weight:** 500 Grams - **Specific uses for product:** Indoor - **Style:** Protection - **Colour:** Black, White - **Included components:** Holder, Dual Float Ball Sensor, Pump, Power Adapter, Splitter Adapter Cable, Silicone Hose, Siphon Break - **Vivarium Type:** Aquarium - **Manufacturer:** SENSTREE ## Images ![Auto Top Off System, ATO System, Fish Tank Sump Water Filler Refiller, Automatic ATO System for Aquarium with Pump,Water replenishment system, DIGITEN Smart ato System for fish tank - Image 1](https://m.media-amazon.com/images/I/61gosvGSoxL.jpg) ## Questions & Answers **Q: What are the dimensions of the pump? Will it fit in a normal 5l water container?** A: Would fit in a normal 5l water container **Q: Does this come with a 3 pin U.K. plug?** A: yes, this does have a UK plug. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Brilliant item! never lets me down. water sensor works, have adjusted to fit lidded tank *by F***Z on 22 February 2026* Looked at multiple auto top off systems and none of the others can be used with a jewel aquarium with a lid. they all seem to be designed to only work with open top tanks. Admittedly I had to butcher the tank attachment to make it fit, but it wasn’t too difficult using a small electric saw to cut off the extra top piece sticking up not needed..This would be the piece that would stop the lid shutting. Now it’s completely under the lid in the back slot place and out of sight. (the other option would be to butcher a slot out of the lid to make it fit) no other system on the market that I looked at had the slightest chance of working. This device is a game changer for me. I never have to top up my aquarium. I have a reservoir bin of approximately 45 L. The pump goes into this reservoir, is topped up from a hose pipe and is kept full ready for each water change, which is done by using a length of airline hose put out the window to drain the tank slowly. The pump just cuts in and out as needed and water changes can take as slow as you want without any bother which is brilliant for shrimp tanks! Keeping reservoir full ahead of time means water is always at room temperature and doesn’t take lots of power to heat. Also water condition is et cetera if needed are much better pre-mixed in the bin. If Reservoir accidentally empties completely without noticing, it’s not a problem as pump just switches off until you fill it again. With an airline control valve on the end of draining pipe you can control the flow then just set it and forget it and do other things for awhile even two or three hours :-) also great for us plant enthusiasts who are always nabbing a little bit of water here and there from the aquarium to water the plants… it just fills itself up again:-) I have to admit it does seem expensive for what it is when you look at it, however for those of us who struggle with tank maintenance, it’s a game changer and a lifesaver! for me it has been well worth the money. And as for noise level well you can’t really hear it at all. Only the actual noise of the water going in. For the perennial problem of the ever present aquarists acquisition disease, yes I would definitely buy this again.:-) oh and thanks to MD tanks for the inspiration ### ⭐⭐⭐⭐⭐ Reliable a year so far *by L***L on 6 January 2026* It’s reliable, and has been in use for more than a year, when my previous purchases of 2 devices of other brands elsewhere online would already have stopped functioning. I could never work out why those stopped working. ### ⭐⭐⭐⭐⭐ Gadgets *by A***R on 12 July 2026* Tricky at first but hopefully it will settle and i'l get used to how sensitive it is, thank you ## Frequently Bought Together - SENSTREE Auto Top Off System, ATO System, Fish Tank Sump Water Filler Refiller, Automatic ATO System for Aquarium with Pump,Water replenishment system, DIGITEN Smart ato System for fish tank - Fluval Carbon 800g complete with net bags --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.be/products/345333783-auto-top-off-system-ato-system-fish-tank-sump-water](https://www.desertcart.be/products/345333783-auto-top-off-system-ato-system-fish-tank-sump-water) --- *Product available on Desertcart Belgium* *Store origin: BE* *Last updated: 2026-09-12*