--- product_id: 539826534 title: "Auto Top Off System Saltwater Aquarium, Water ATO for Reef Fresh Tank" brand: "useek" price: "328.89 DT" currency: TND in_stock: true reviews_count: 13 category: "Useek" url: https://www.desertcart.tn/products/539826534-auto-top-off-system-saltwater-aquarium-water-ato-for-reef store_origin: TN region: Tunisia --- # 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:** 328.89 DT **Availability:** ✅ In Stock ## Summary > 💧 Keep your reef thriving with precision and style — 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?** 328.89 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/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 - • **Peace of Mind Warranty:** Backed by a 2-year warranty and responsive customer support for worry-free, long-term aquarium care. - • **Ultra-Compact Elegance:** Nano-sized 0.7-inch diameter design fits discreetly in any rimmed or rimless tank without clutter. - • **Smart Overflow Protection:** QST technology detects abnormal refill times and halts the pump to prevent flooding or dry running. - • **Precision Water Level Control:** Maintains aquarium water levels with 1mm accuracy to stabilize salinity and protect your reef ecosystem. - • **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 desertcart.com : Useek Auto Top Off System Saltwater Aquarium, Water ATO for Reef Fresh Tank | Stable Water Levels & Salinity, QST Real-Time Anti-Overflow, 1mm Precision Sensing, Easy Setup, 2-Year Warranty, Green : Pet Supplies Review: Buy this one! - I can't say enough good things about this company and their product. I bought this several years ago and it had reliably kept my saltwater tank full. The pump finally started having issues. I couldn't find a replacement. I reached out to the company and they sent me a replacement for free. It was incredible! 10/10 the best Review: Set It and Forget It—Reliable ATO at a Great Price - I’ve been using this ATO on my reef tank and it’s been rock solid. Installation took only a few minutes, the optical sensor has been very reliable, and it keeps my water level extremely consistent. That stability has also helped keep my salinity right where I want it, which is critical for a reef tank. The pump is quiet, the included tubing was enough for my setup, and I appreciate the built-in safety features that prevent overfilling. It has been operating without any false alarms or issues. For the price, I honestly wasn’t expecting this level of performance. If you’re looking for an affordable, dependable ATO for a saltwater aquarium, I wouldn’t hesitate to recommend this one. It’s one of those pieces of equipment you install and then forget about—which is exactly what you want from an auto top-off system. ## 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 | | Additional Features | Lightweight, Rimless | | Best Sellers Rank | #7,905 in Pet Supplies ( See Top 100 in Pet Supplies ) #14 in Aquarium Water Pumps #53 in Aquarium Water Treatments | | Brand | Useek | | Brand Name | Useek | | Color | Green-1 | | Customer Reviews | 4.0 out of 5 stars 842 Reviews | | Included Components | Pump | | Item Highlight | Stable Water Levels & Salinity, QST Real-Time Anti-Overflow, 1mm Precision Sensing, Easy Setup, 2-Year Warranty, Green | | Item Type Name | Pump | | Item Weight | 0.4 kg | | Manufacturer | Useek | | Manufacturer Part Number | AT-200 | | Material | Acrylonitrile Butadiene Styrene (ABS) | | Material Type | Acrylonitrile Butadiene Styrene (ABS) | | Model Number | AT-200 | | Number of Items | 1 | | Pet Type | Fish | | Product Style | Compact,Simple | | Special Feature | Lightweight, Rimless | | Style | Compact,Simple | | Target Species | Fish | | UPC | 799355750325 | | Unit Count | 1 Count | | Vivarium Type | Aquarium | | Warranty Description | 1 | ## Product Details - **Brand:** Useek - **Color:** Green-1 - **Included Components:** Pump - **Item Weight:** 0.4 kg - **Material:** Acrylonitrile Butadiene Styrene - **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 ### ⭐⭐⭐⭐⭐ Buy this one! *by B***T on August 13, 2026* I can't say enough good things about this company and their product. I bought this several years ago and it had reliably kept my saltwater tank full. The pump finally started having issues. I couldn't find a replacement. I reached out to the company and they sent me a replacement for free. It was incredible! 10/10 the best ### ⭐⭐⭐⭐⭐ Set It and Forget It—Reliable ATO at a Great Price *by C***D on July 30, 2026* I’ve been using this ATO on my reef tank and it’s been rock solid. Installation took only a few minutes, the optical sensor has been very reliable, and it keeps my water level extremely consistent. That stability has also helped keep my salinity right where I want it, which is critical for a reef tank. The pump is quiet, the included tubing was enough for my setup, and I appreciate the built-in safety features that prevent overfilling. It has been operating without any false alarms or issues. For the price, I honestly wasn’t expecting this level of performance. If you’re looking for an affordable, dependable ATO for a saltwater aquarium, I wouldn’t hesitate to recommend this one. It’s one of those pieces of equipment you install and then forget about—which is exactly what you want from an auto top-off system. ### ⭐⭐⭐⭐⭐ Practical, stable, and easy to use *by N***T on August 17, 2026* I really liked this ATO system because it is very easy to install and use. It is compact, stays stable, and the included accessories make installation much simpler. I also appreciate the good lighting on the components and the fact that it feels well-built and durable. It is an excellent option for maintaining the aquarium's water level without having to constantly keep an eye on it ## 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? - 🛒 **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/539826534-auto-top-off-system-saltwater-aquarium-water-ato-for-reef](https://www.desertcart.tn/products/539826534-auto-top-off-system-saltwater-aquarium-water-ato-for-reef) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-09-28*