---
product_id: 577042051
title: "Useek Auto Top Off for Saltwater Aquarium Water ATO System for Both Reef and Fresh Tank - Blue"
brand: "useek"
price: "$83.80"
currency: USD
in_stock: true
reviews_count: 5
category: "Useek"
url: https://www.desertcart.us/products/577042051-useek-auto-top-off-for-saltwater-aquarium-water-ato-system
store_origin: US
region: United States of America
---

# Auto water level maintenance Compact 0.7-inch nano design Real-time refill protection Useek Auto Top Off for Saltwater Aquarium Water ATO System for Both Reef and Fresh Tank - Blue

**Brand:** useek
**Price:** $83.80
**Availability:** ✅ In Stock

## Summary

> 💧 Keep your reef thriving with smart, sleek, and safe auto top-off technology!

## Quick Answers

- **What is this?** Useek Auto Top Off for Saltwater Aquarium Water ATO System for Both Reef and Fresh Tank - Blue by useek
- **How much does it cost?** $83.80 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/577042051-useek-auto-top-off-for-saltwater-aquarium-water-ato-system)

## 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 quick, hassle-free installation—perfect for busy pros and hobbyists alike.
- • **Nano-Sized Elegance:** Ultra-compact 0.7-inch diameter fits discreetly in any rimmed or rimless aquarium without clutter.
- • **Smart Safety Alerts:** QST technology detects refill anomalies, stopping the pump to avoid overfilling or dry running.
- • **Peace of Mind Warranty:** Backed by a 2-year warranty and responsive customer support for worry-free aquarium care.
- • **Effortless Water Balance:** Automatically maintains stable water levels to prevent salinity spikes and protect your aquatic ecosystem.

## Overview

The Useek Auto Top Off (ATO) System is a compact, reliable solution designed to automatically maintain water levels in both saltwater and freshwater aquariums. Featuring a space-saving 0.7-inch diameter design, real-time refill protection with QST technology, and an easy installation kit, it prevents salinity fluctuations and safeguards aquatic life. Supported by a two-year warranty and responsive customer service, this ATO system is ideal for professional aquarium keepers seeking consistent, low-maintenance water management.

## Description

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

Review: Brisé après moins d’un an, pas fiable - Je suis revenu de vacances pour m’aperçevoir qu’il faisait un bruit horrible et que le moteur de la pompe à eau n’arrivait plus à pousser l’eau dans le tuyau vers l’aquarium. Argent gaspillé et faillit tuer tous mes poissons d’eau salée.
Review: Good - ⭐⭐⭐⭐⭐ 5/5 I’ve been using the Useek AT-200 Smart ATO Lite for my aquarium, and it has worked perfectly. The installation was quick and simple, and the sensors are very accurate. It automatically maintains the water level without any issues, giving me peace of mind when I’m busy or away from home. The build quality feels solid, and the device is reliable and easy to use. Since installing it, I no longer have to worry about manually topping off water every day. It has made aquarium maintenance much easier and more consistent. Highly recommended for anyone looking for a dependable and affordable 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 | B0CFVWDKMC |
| Additional Features | Space-Saving, Real-Time Protected, Automatic Water Level Maintenance |
| Best Sellers Rank | #48,013 in Pet Supplies ( See Top 100 in Pet Supplies ) #233 in Aquarium Lights |
| Brand | Useek |
| Brand Name | Useek |
| Color | Blue |
| Customer Reviews | 4.0 out of 5 stars 489 Reviews |
| Included Components | Pump |
| Item Shape | Irregular shape |
| Item Type Name | Pump |
| Item Weight | 0.4 Kilograms |
| 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 |
| Pet Type | Fish |
| Product Style | Compact |
| Shape | Irregular shape |
| Special features | Space-Saving, Real-Time Protected, Automatic Water Level Maintenance |
| Specific Uses For Product | Aquarium for fish |
| Specific uses for product | Aquarium for fish |
| Target Species | Fish |
| UPC | 799355749961 |
| Unit Count | 1.0 Count |
| Vivarium Type | Aquarium |

## 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

![Useek 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

### ⭐ Brisé après moins d’un an, pas fiable
*by M***Y on 8 August 2025*

Je suis revenu de vacances pour m’aperçevoir qu’il faisait un bruit horrible et que le moteur de la pompe à eau n’arrivait plus à pousser l’eau dans le tuyau vers l’aquarium. Argent gaspillé et faillit tuer tous mes poissons d’eau salée.

### ⭐⭐⭐⭐⭐ Good
*by M***I on 2 June 2026*

⭐⭐⭐⭐⭐ 5/5 I’ve been using the Useek AT-200 Smart ATO Lite for my aquarium, and it has worked perfectly. The installation was quick and simple, and the sensors are very accurate. It automatically maintains the water level without any issues, giving me peace of mind when I’m busy or away from home. The build quality feels solid, and the device is reliable and easy to use. Since installing it, I no longer have to worry about manually topping off water every day. It has made aquarium maintenance much easier and more consistent. Highly recommended for anyone looking for a dependable and affordable auto top-off system! 🐠💧

### ⭐⭐⭐⭐⭐ Muy preciso
*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
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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-08-29*