---
product_id: 577042051
title: "Auto Top Off for Saltwater Aquarium Water ATO System for Both Reef and Fresh Tank - Blue"
brand: "useek"
price: "452.85 DT"
currency: TND
in_stock: true
reviews_count: 5
category: "Useek"
url: https://www.desertcart.tn/products/577042051-auto-top-off-for-saltwater-aquarium-water-ato-system-both
store_origin: TN
region: Tunisia
---

# 0.7-inch compact design 2-year warranty & support Real-time refill monitoring Auto Top Off for Saltwater Aquarium Water ATO System for Both Reef and Fresh Tank - Blue

**Brand:** useek
**Price:** 452.85 DT
**Availability:** ✅ In Stock

## Summary

> 🌊 Keep your reef thriving with precision and style!

## 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?** 452.85 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/577042051-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 for effortless installation in rimmed or rimless aquariums
- • **Nano-Sized Elegance:** Sleek 0.7-inch diameter fits discreetly in any tank setup
- • **Peace of Mind Warranty:** Two-year coverage with responsive customer service ensures lasting reliability
- • **Smart Refill Protection:** QST tech halts pump if refill time exceeds safe limits, preventing overflows
- • **Salinity Stability Guaranteed:** Automatically maintains water level to keep salt concentration perfectly balanced

## Overview

The Useek Auto Top Off (ATO) system is a compact, intelligent solution designed for both saltwater and freshwater aquariums. Its 0.7-inch nano size ensures a discreet fit, while advanced QST technology monitors refill times to prevent overfilling and sensor errors. By maintaining consistent water levels, it stabilizes salinity and promotes a healthy aquatic environment. Easy to install and backed by a two-year warranty, this ATO system is a must-have for serious aquarium enthusiasts seeking hassle-free, reliable water management.

## Description

Useek Auto Top Off for Saltwater Aquarium Water ATO System for Both Reef and Fresh Tank

Review: This was easy to set up. It is small and discreet. It has stabilized the water level and appears to work as expected. The sensor does what it was created to do. So far, so good! And the price point is perfect.
Review: I bought this ATO for my nano saltwater aquarium and would not buy again. It failed twice in about 4-5 months. The magnet is not strong enough so any large turbo snail can push the sensor up, making the water level go up. Also, the glow of the light is annoying at night. Pay more money now for a good ATO with a strong magnet and a cover over the light sensor

## 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 |
| Batteries Included | No |
| Best Sellers Rank | #24,819 in Pet Supplies ( See Top 100 in Pet Supplies ) #99 in Aquarium Lights |
| Color | Blue |
| Customer Reviews | 4.0 4.0 out of 5 stars (398) |
| Date First Available | 22 August 2023 |
| Item Weight | 399 g |
| Item model number | AT-200 |
| Package Dimensions | 16.4 x 16.1 x 6.8 cm; 399 g |
| Special Features | Space-Saving, Real-Time Protected, Automatic Water Level Maintenance |
| Specific Uses | Reef and Freshwater Aquariums |
| batteries required | No |

## Product Details

- **Brand:** Useek
- **Item weight:** 0.4 Kilograms
- **Material:** Acrylonitrile Butadiene Styrene (ABS)
- **Shape:** Irregular shape
- **Special features:** Space-Saving, Real-Time Protected, Automatic Water Level Maintenance

## 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)

## 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

### ⭐⭐⭐⭐⭐ Review
*by T***E on 10 February 2026*

This was easy to set up. It is small and discreet. It has stabilized the water level and appears to work as expected. The sensor does what it was created to do. So far, so good! And the price point is perfect.

### ⭐ Review
*by R***K on 27 December 2025*

I bought this ATO for my nano saltwater aquarium and would not buy again. It failed twice in about 4-5 months. The magnet is not strong enough so any large turbo snail can push the sensor up, making the water level go up. Also, the glow of the light is annoying at night. Pay more money now for a good ATO with a strong magnet and a cover over the light sensor

### ⭐⭐⭐⭐⭐ Review
*by R***O on 3 March 2025*

Excelente producto muy buena precisión y fácil de instalar

## 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

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**Shop now:** [https://www.desertcart.tn/products/577042051-auto-top-off-for-saltwater-aquarium-water-ato-system-both](https://www.desertcart.tn/products/577042051-auto-top-off-for-saltwater-aquarium-water-ato-system-both)

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-05-31*