--- product_id: 550266203 title: "Auto Top Off for Saltwater Aquarium Water ATO System for Both Reef and Fresh Tank - Blue" brand: "useek" price: "309.38 DT" currency: TND in_stock: true reviews_count: 13 category: "Useek" url: https://www.desertcart.tn/products/550266203-auto-top-off-for-saltwater-aquarium-water-ato-system-both store_origin: TN region: Tunisia --- # 0.7-inch nano compact design Easy all-in-one installation kit Real-time QST protection & alerts Auto Top Off for Saltwater Aquarium Water ATO System for Both Reef and Fresh Tank - Blue **Brand:** useek **Price:** 309.38 DT **Availability:** ✅ In Stock ## Summary > 🌊 Keep your reef flawless with zero hassle—top off like a pro! ## Quick Answers - **What is this?** Auto Top Off for Saltwater Aquarium Water ATO System for Both Reef and Fresh Tank - Blue by useek - **How much does it cost?** 309.38 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/550266203-auto-top-off-for-saltwater-aquarium-water-ato-system-both) ## 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 - • **Plug & Play Setup:** Complete kit ensures a hassle-free installation so you can upgrade your reef or freshwater tank in minutes. - • **Peace of Mind Warranty:** Backed by a two-year warranty and responsive customer support, ensuring your investment stays protected and stress-free. - • **Ultra-Compact Elegance:** Sleek 0.7-inch diameter design fits discreetly in any rimmed or rimless aquarium without disrupting your setup’s aesthetic. - • **Effortless Water Level Stability:** Automatically maintains perfect water levels to prevent salinity spikes and protect your aquatic ecosystem. - • **Smart Safety with QST Technology:** Monitors refill times and halts operation if anomalies occur, safeguarding against overfill, dry running, and sensor errors. ## Overview The Useek Auto Top Off (ATO) System is a compact, reliable solution designed for both saltwater and freshwater aquariums. Its nano-sized 0.7-inch pump automatically maintains stable water levels, preventing salinity fluctuations that can harm aquatic life. Featuring advanced QST technology, it provides real-time protection by detecting refill anomalies and stopping the pump to avoid overfilling or dry running. Easy to install with a complete kit included, this modern ATO system is backed by a two-year warranty and dedicated customer support, making it an essential upgrade for any serious aquarium enthusiast. ## Description Product 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! LED Indicators Red and Blue Alternating Flicker: Your device is currently booting up. Blue LED 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. Red LED Flicker 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 Review: Reliable Auto Top Off System for Saltwater & Freshwater Tanks - This Auto Top Off system has been a great addition to my aquarium setup! It helps keep the water level stable without constant monitoring, which is especially important for maintaining proper salinity in my saltwater tank. The setup was straightforward, and it works well for both reef and freshwater tanks. I also like the compact design and the blue color gives it a clean look with my setup. The sensors respond quickly, and the system runs quietly. It definitely saves time compared to manually topping off water every day. Review: Reliable, Easy to Set Up, and Gives Me Peace of Mind - I’ve been using this auto top off system on my aquarium for a while now, and it’s honestly made tank maintenance so much easier. Setup was surprisingly simple, and the instructions were straightforward enough that I had it running pretty quickly. The sensor works reliably, and I like not having to constantly worry about water levels or evaporation anymore. The build quality feels solid, and it’s been running quietly and consistently without issues. For the price, this thing is absolutely worth it if you want a simple, stress-free ATO system for a reef or freshwater tank. ## 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 | B0CFVWDKMC | | Additional Features | Space-Saving, Real-Time Protected, Automatic Water Level Maintenance | | Best Sellers Rank | #9,426 in Pet Supplies ( See Top 100 in Pet Supplies ) #23 in Aquarium Water Pumps | | Brand | Useek | | Brand Name | Useek | | Color | Blue | | Customer Reviews | 3.9 out of 5 stars 730 Reviews | | Included Components | Pump | | Item Shape | Irregular shape | | Item Type Name | Pump | | Item Weight | 0.4 Kilograms | | Manufacturer | Useek | | Manufacturer Part Number | AT-200 | | Material | Acrylonitrile Butadiene Styrene (ABS) | | Material Type | Acrylonitrile Butadiene Styrene (ABS) | | Model Number | AT-200 | | Product Style | Modern | | Shape | Irregular shape | | Special Feature | Space-Saving, Real-Time Protected, Automatic Water Level Maintenance | | Specific Uses For Product | Reef and Freshwater Aquariums | | Target Species | Fish | | UPC | 799355749961 | | Unit Count | 1.00 Count | | Vivarium Type | Aquarium | | Warranty Description | 1 | ## Product Details - **Brand:** Useek - **Color:** Blue - **Included Components:** Pump - **Item Weight:** 0.4 Kilograms - **Material:** Acrylonitrile Butadiene Styrene (ABS) - **Shape:** Irregular shape - **Special Feature:** Space-Saving, Real-Time Protected, Automatic Water Level Maintenance - **Specific Uses For Product:** Reef and Freshwater Aquariums - **Style:** Modern - **UPC:** 799355749961 ## Images ![Auto Top Off for Saltwater Aquarium Water ATO System for Both Reef and Fresh Tank - Blue - Image 1](https://m.media-amazon.com/images/I/713hjxk8HnL.jpg) ![Auto Top Off for Saltwater Aquarium Water ATO System for Both Reef and Fresh Tank - Blue - Image 2](https://m.media-amazon.com/images/I/71P1QpQD-JL.jpg) ![Auto Top Off for Saltwater Aquarium Water ATO System for Both Reef and Fresh Tank - Blue - Image 3](https://m.media-amazon.com/images/I/61mtLAcdJBL.jpg) ![Auto Top Off for Saltwater Aquarium Water ATO System for Both Reef and Fresh Tank - Blue - Image 4](https://m.media-amazon.com/images/I/61-+53lG1fL.jpg) ![Auto Top Off for Saltwater Aquarium Water ATO System for Both Reef and Fresh Tank - Blue - Image 5](https://m.media-amazon.com/images/I/61qUqcQjeoL.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 ### ⭐⭐⭐⭐⭐ Reliable Auto Top Off System for Saltwater & Freshwater Tanks *by A***A on May 7, 2026* This Auto Top Off system has been a great addition to my aquarium setup! It helps keep the water level stable without constant monitoring, which is especially important for maintaining proper salinity in my saltwater tank. The setup was straightforward, and it works well for both reef and freshwater tanks. I also like the compact design and the blue color gives it a clean look with my setup. The sensors respond quickly, and the system runs quietly. It definitely saves time compared to manually topping off water every day. ### ⭐⭐⭐⭐⭐ Reliable, Easy to Set Up, and Gives Me Peace of Mind *by S***Y on May 11, 2026* I’ve been using this auto top off system on my aquarium for a while now, and it’s honestly made tank maintenance so much easier. Setup was surprisingly simple, and the instructions were straightforward enough that I had it running pretty quickly. The sensor works reliably, and I like not having to constantly worry about water levels or evaporation anymore. The build quality feels solid, and it’s been running quietly and consistently without issues. For the price, this thing is absolutely worth it if you want a simple, stress-free ATO system for a reef or freshwater tank. ### ⭐ Shutoff stopped functioning. *by J***N on May 19, 2026* I purchased two units. They worked well for a couple of weeks. I reconnected the units because of a vacation absence. The units Didn’t shut off. As a result the aquarium flooded over a gallon or so before I noticed. Fortunately it was prior to leaving. I cannot obviously trust this item! ## Frequently Bought Together - Useek Auto Top Off for Saltwater Aquarium Water ATO System for Both Reef and Fresh Tank - Blue - Aquatic Life RO Buddie 4-Stage Reverse Osmosis Deionization Water Filter System RO/DI Filtration Units for Aquarium, 50 GPD --- ## 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.tn/products/550266203-auto-top-off-for-saltwater-aquarium-water-ato-system-both](https://www.desertcart.tn/products/550266203-auto-top-off-for-saltwater-aquarium-water-ato-system-both) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-06-05*