--- product_id: 541632578 title: "3-in-1 ReefATO + ATO Auto Top Off System for Aquarium | Water On Floor Alarm | App Controled with Fish Tank Temperature Probe" brand: "red sea" price: "$433.38" currency: USD in_stock: true reviews_count: 5 category: "Red Sea" url: https://www.desertcart.us/products/541632578-3-in-1-reefato-ato-auto-top-off-system-aquarium store_origin: US region: United States of America --- # Solid-state EC water level sensor Real-time ReefBeat app monitoring ±0.1° accurate temperature probe 3-in-1 ReefATO + ATO Auto Top Off System for Aquarium | Water On Floor Alarm | App Controled with Fish Tank Temperature Probe **Brand:** red sea **Price:** $433.38 **Availability:** ✅ In Stock ## Summary > 🌊 Keep your reef flawless and worry-free with smart, silent precision! ## Quick Answers - **What is this?** 3-in-1 ReefATO + ATO Auto Top Off System for Aquarium | Water On Floor Alarm | App Controled with Fish Tank Temperature Probe by red sea - **How much does it cost?** $433.38 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/541632578-3-in-1-reefato-ato-auto-top-off-system-aquarium) ## Best For - red sea enthusiasts ## Why This Product - Trusted red sea brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Smart App Integration:** Monitor water levels and temperature anytime via the intuitive ReefBeat app—stay connected, always. - • **Advanced Leak Detection:** Saltwater-resistant titanium probes detect leaks instantly, protecting your reef investment. - • **Fail-Safe Safety Mechanisms:** Automatic pump shutoff prevents overflow, dry running, and alerts you to anomalies in real time. - • **Precision Reef-Level Control:** Five titanium probes ensure flawless water level accuracy with fail-safe backup sensors. - • **Silent & Compact Pump Design:** Powerful yet whisper-quiet pump fits standard jerrycans for seamless, discreet operation. ## Overview The Red Sea 3-in-1 ReefATO+ is a premium auto top-off system designed specifically for saltwater reef aquariums. Featuring solid-state EC titanium probes, it delivers precise water level monitoring with built-in fail-safes and backup sensors. Integrated with the ReefBeat app, it offers real-time water level and temperature tracking with ±0.1° accuracy. Its compact, quiet pump fits standard jerrycans, while advanced leak detection ensures maximum safety. Note: optimized exclusively for saltwater environments, not suitable for freshwater tanks. ## Description The ReefATO+ is an exceptionally reliable auto top-off system that includes a highly accurate temperature monitor plus an external leak detector and is supplied with a smart controller and useful ReefBeat features. It has a unique solid-state level sensor, with five titanium probes that can pinpoint if you are above, below, or at the desired water level, along with backup OFF sensors, a fail-safe mechanism that stops the pump if it is operating for too long, and of course ReefBeat notifications if anything is out of the ordinary. How it Works - The EC technology titanium probes detect the water levels that triggers the pump to be switched on and off to maintain a stable water level and salinity. Complete Installation Kit Sensor holder and magnetic corner mounting bracket for 12mm ½” glass. 3M /10′ – 1.5mm / 1/16″ thick silicone tubing ID 5mm / 0.2″. Silent flow – Tube holder, clips on 4 – 12mm / ½” glass. Siphon Breaker. Safe. l-proof (solid-state EC technology) water level sensor with built-in safety shutoff. Automatic shut-down if the sensor is not connected, if the pump runs significantly longer than normal, if the RO reservoir runs out of water or if a leak is detected. Review: I absolutely love this ATO it was super easy to set up the wire less functions worked flawlessly and this by far had the best associated app i i found. However what is not clearly explained on the box or in the instructions is that this does not work in fresh water, the sensors need salt or sea water for the proper conductivity to accurately measure the water level , i found out after setting it up , installing the app mounting the control box, sensor control and the pump into the reservoir running it and having the pump time out and the app tell me that the water was still low when i could see that it was where i set it and still showing low when i submerged the sensor, this is when i went on Red Seas site and discovered that it does not work for Fresh water. So i had to send it back...If you have a REEF tank I highly recommend this , if you have fresh water PASS. Red Sea PLEASE make a sensor for fresh water and I will definitely buy this again Review: O sensor não funciona. Simplesmente ele fica sempre abaixo do nível. Muito caro e não entrega o que promete e agora estou com produto ruim em mãos e não sei como resolver o problema. ## Features - Fail-proof (solid-state EC technology) water level sensor, with built-in back-up pump-OFF probes located 2.5cm / 1” above the normal pump-OFF point. - The full array of the Reef-Spec titanium probes gives an indication at all times of the actual water level relative to the sensor, which can be seen on the ReefBeat App at all times. - The temperature sensor integrated in the ATO+ sensor has been pre-calibrated to give an accuracy of ±0.1°. - Safe, Powerful and Quiet ATO Pump - Cylindrical design with diameter of 4.5cm / 1.8” to fit inside standard jerrycans. - Leak Detector The highly sensitive, Reef-Spec leak detector with saltwater resistant titanium probes detects the full range of waters from RODI to seawater. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CBQ8TXNZ | | Batteries Included | No | | Best Sellers Rank | #51,053 in Pet Supplies ( See Top 100 in Pet Supplies ) #2,830 in Aquarium Accessories | | Customer Reviews | 4.1 4.1 out of 5 stars (40) | | Date First Available | 22 July 2023 | | Item Weight | 1.67 Kilograms | | Item model number | AEELDPRE0030000 | | Package Dimensions | 25.7 x 17.4 x 12.9 cm; 1.67 kg | | Quantity | 1 | | batteries required | No | ## Images ![3-in-1 ReefATO + ATO Auto Top Off System for Aquarium | Water On Floor Alarm | App Controled with Fish Tank Temperature Probe - Image 1](https://m.media-amazon.com/images/I/519wNeV-2NL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by D***N on 18 November 2023* I absolutely love this ATO it was super easy to set up the wire less functions worked flawlessly and this by far had the best associated app i i found. However what is not clearly explained on the box or in the instructions is that this does not work in fresh water, the sensors need salt or sea water for the proper conductivity to accurately measure the water level , i found out after setting it up , installing the app mounting the control box, sensor control and the pump into the reservoir running it and having the pump time out and the app tell me that the water was still low when i could see that it was where i set it and still showing low when i submerged the sensor, this is when i went on Red Seas site and discovered that it does not work for Fresh water. So i had to send it back...If you have a REEF tank I highly recommend this , if you have fresh water PASS. Red Sea PLEASE make a sensor for fresh water and I will definitely buy this again ### ⭐ Review *by N***A on 15 February 2026* O sensor não funciona. Simplesmente ele fica sempre abaixo do nível. Muito caro e não entrega o que promete e agora estou com produto ruim em mãos e não sei como resolver o problema. ### ⭐⭐⭐⭐⭐ Review *by P***P on 24 November 2025* Another great addition to my Red Sea setup, pump runs quiet and flawlessly and helped alert me to a faulty temperature sensor on another part of my system. I like the fact that it can be calibrated and will let you know how much water you have remaining. ## Frequently Bought Together - Red Sea 3-in-1 ReefATO + ATO Auto Top Off System for Aquarium | Water On Floor Alarm | App Controled with Fish Tank Temperature Probe - FastRack 5 Gallon Hedpak with Cap | BPA-free, Food-Grade, and Leak-Proof | White Water Container | Ideal for brewing, fermentation, or storage --- ## 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.us/products/541632578-3-in-1-reefato-ato-auto-top-off-system-aquarium](https://www.desertcart.us/products/541632578-3-in-1-reefato-ato-auto-top-off-system-aquarium) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-05-17*