--- product_id: 539826534 title: "Auto Top Off System Saltwater Aquarium, Water ATO for Reef Fresh Tank" brand: "useek" price: "€ 95.19" currency: EUR in_stock: true reviews_count: 13 url: https://www.desertcart.sk/products/539826534-auto-top-off-system-saltwater-aquarium-water-ato-for-reef store_origin: SK region: Slovakia --- # 1mm precision sensing 0.7 inch compact design QST real-time anti-overflow Auto Top Off System Saltwater Aquarium, Water ATO for Reef Fresh Tank **Brand:** useek **Price:** € 95.19 **Availability:** βœ… In Stock ## Summary > πŸ’§ Keep your reef thriving with precision and style β€” never miss a drop! ## Quick Answers - **What is this?** Auto Top Off System Saltwater Aquarium, Water ATO for Reef Fresh Tank by useek - **How much does it cost?** € 95.19 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/539826534-auto-top-off-system-saltwater-aquarium-water-ato-for-reef) ## Best For - useek enthusiasts ## Why This Product - Trusted useek brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Peace of Mind Warranty:** Backed by a 2-year warranty and responsive customer support for worry-free, long-term aquarium care. - β€’ **Ultra-Compact Elegance:** Nano-sized 0.7-inch diameter design fits discreetly in any rimmed or rimless tank without clutter. - β€’ **Smart Overflow Protection:** QST technology detects abnormal refill times and halts the pump to prevent flooding or dry running. - β€’ **Precision Water Level Control:** Maintains aquarium water levels with 1mm accuracy to stabilize salinity and protect your reef ecosystem. - β€’ **Effortless Setup & Versatility:** Complete kit ensures quick installation and seamless integration for all saltwater and reef tanks. ## Overview The Useek Auto Top Off System is a compact, high-precision aquarium water leveler designed specifically for saltwater and reef tanks. Featuring 1mm sensing accuracy and advanced QST real-time anti-overflow technology, it automatically maintains stable water levels and salinity, protecting aquatic life from harmful fluctuations. Its sleek 0.7-inch diameter design fits unobtrusively in any tank setup, while the easy installation kit and 2-year warranty ensure reliable, hassle-free operation for dedicated aquarium enthusiasts. ## Description All aquariums experience regular water evaporation. As the water evaporates, the aquarium's water level decreases, leading to an increase in salinity concentration, which can negatively impact your aquatic life. Manually adding fresh water is a tiresome yet crucial daily chore. Useek Auto top off systems automate this bothersome task, saving you time. ATO not only help maintain a consistent water level but also a stable salinity level, keeping your tank inhabitants content and healthy. Set off on a vacation with peace of mind, knowing your water levels are well managed! Smart ATO is an automatic water replenishment system suitable for aquariums of any size. It combines ATO level sensors with fault safety sensors and integrates Quick Safety Technology (QST), providing real-time protection against any malfunction and detecting empty reservoirs.Smart ATO offers you a safe and stable automatic water replenishment option! Your device is currently booting up. Solid blue LED: Standby mode. Slow flashing blue LED: Refilling water/starting water pump Rapid flashing in a brief period: Water level has reached the HIGH sensor; anti-overfilling feature is activated. 1. Bubbling interference is present 2.Water tank is low on water.You need to clean the probe or move the sensor to a bubble-free area, or add water to the water storage tank. ATO Sensor precision: 1mm Power supply: AC 100-240V/50-60 Hz input, DC 12V/1A output. Power cord length: 6 feet Pump flow rate: 74 gallons/hour (270 liters/hour) Pump cord length: 6 feet Installation thickness: 15mm Tubing: 6 feet, inner diameter 7mm ## Features - WHY YOU NEED ATO? - All Aquarium regularly evaporate water. In salt water Aquarium, as the water evaporates, the water level in Aquarium will drop and the salinity concentration will rise. Compared with other methods,The ATO system automatically maintains the water level in the aquarium, preventing fluctuations in salinity concentration and maintaining a stable and healthy environment for aquatic life. - SPACE-SAVING, COMPACT DESIGN - With a nano size of only 0.7 inches diameter, this Auto Top Off for aquariums is both unobtrusive and elegant, fitting seamlessly in rimmed or rimless tanks and sumps. - REAL-TIME PROTECTION WITH QST - Our ATO system carefully calculates and adjusts to the ideal fill time, offering visual alerts and stopping the pump if it detects a refilling time 6 times longer than expected, ensuring protection against overfilling, dry running, and sensor malfunctions. - EASY INSTALLATION & VERSATILE USE - The Auto Top Off kit includes everything you need for a hassle-free setup, making it simple to integrate into any rimmed or rimless aquarium. A perfect gift for aquarium enthusiasts, this system is a delightful surprise for friends and family alike. - TWO-YEAR WARRANTY & RESPONSIVE CUSTOMER SERVICE - Your satisfaction is our priority, so we offer a two-year product warranty and friendly customer support to address any questions or concerns. Enjoy peace of mind with our free replacement policy and helpful assistance. ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B0C5DZ769T | | Date First Available | May 16, 2023 | | Department | Men's | | Item Model Number | AT-200 | | Manufacturer | Useek | | Package Dimensions | 6.38 x 6.26 x 2.8 inches; 14.07 ounces | ## Product Details - **Brand:** Useek - **Color:** Green-1 - **Included Components:** Pump - **Item Weight:** 0.4 kg - **Material:** Acrylonitrile Butadiene Styrene (ABS) - **Number of Items:** 1 - **Special Feature:** Lightweight, Rimless - **Style:** Compact,Simple - **UPC:** 799355750325 - **Vivarium Type:** Aquarium ## Images ![Auto Top Off System Saltwater Aquarium, Water ATO for Reef Fresh Tank - Image 1](https://m.media-amazon.com/images/I/71d6+DGjiDL.jpg) ## Available Options This product comes in different **Color** options. ## Questions & Answers **Q: Would this work on a 60 gallon AIO? I’ve only had it on a nano** A: More surface area = longer top off **Q: Does the sensor light up or is there no light in the sensor?** A: It lights up. It blinks when topping off ## Customer Reviews ### ⭐⭐⭐⭐⭐ Aquarium maintenance made easy!! *by on Reviewed in the United States October 8, 2026* This automatic top-off system has been such a wonderful addition to my aquarium setup! It keeps the water level consistent without me having to constantly check the tank or manually add water throughout the day. Installation was surprisingly quick and straightforward, and everything needed to get started was included in the box. The sensor is compact and accurate, the pump runs quietly, and the tubing is flexible enough to position exactly where I need it. I especially appreciate the anti-overflow protection because it gives me extra peace of mind when I’m away from home or busy with other things. The entire system feels sturdy, well made, and thoughtfully designed without taking up much space around the tank. It is suitable for both freshwater and saltwater aquariums, making it a versatile option for different setups. My aquarium’s water level stays much more stable now, and my daily maintenance routine is noticeably easier. This is an incredibly convenient little system that works exactly as expected. I’m extremely happy with it and would absolutely recommend it to other aquarium owners! ### ⭐⭐⭐⭐⭐ Excellent addition to my setup *by on Reviewed in the United States September 11, 2026* I've been extremely happy with this auto top off system. Installation was quick and straightforward, and it started working perfectly right out of the box. The compact design takes up very little space in my setup, and it does an excellent job maintaining a consistent water level without constant monitoring.One of the biggest benefits for me has been the peace of mind it provides. I no longer have to worry about evaporation affecting water levels, and the built-in safety features give me confidence that the system will operate reliably. It's made aquarium maintenance much easier and has helped keep my tank stable.If you're looking for a dependable, easy-to-use ATO system, I highly recommend this product. ### ⭐⭐⭐⭐ Used for aquaculture and hydroponics *by on Reviewed in the United States May 20, 2026* I love this thing but it never seems to have the longevity I want it to. That said for the money it's incredible. Ive used this for fresh water and saltwater topoff for years. I also use this to help me change out water in my hydroponics system. The only problem I've had with it as a topoff over about 6 years functionality wise is there's been an occasion or two where it's dumped the entire container into the main tank. I've been fortunate to work the math out so the salinity in my saltwater tank didn't change enough to cause issues. Plan accordingly. Probably don't have a 30 gallon fresh water container for ATO if your saltwater system is 65 gallons. ## Frequently Bought Together - Useek Auto Top Off for Saltwater Aquarium Water ATO System for Both Reef and Fresh Tank - Green - Aquatic Life RO Buddie 4-Stage Reverse Osmosis Deionization Water Filter System RO/DI Filtration Units for Aquarium, 50 GPD --- ## 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.sk/products/539826534-auto-top-off-system-saltwater-aquarium-water-ato-for-reef](https://www.desertcart.sk/products/539826534-auto-top-off-system-saltwater-aquarium-water-ato-for-reef) --- *Product available on Desertcart Slovakia* *Store origin: SK* *Last updated: 2026-10-22*