XPAQUA Sumpless ATO2

XP Aqua Sumpless ATO2

Overview

The XP Aqua Sumpless ATO2 is a fully automatic top-off system designed specifically for aquariums without a sump, such as all-in-one (AIO) or nano-style tanks. Using a dual optical sensor and smart controller, it precisely maintains the water level in your display tank or rear filtration chamber—without the need for bulky floats or complicated setups.

Compact, quiet, and easy to install, the Sumpless ATO2 includes everything you need to automate top-offs directly in your aquarium, keeping salinity and water parameters stable while saving you time on daily maintenance.

Product Specifications

• Product Type: Auto top-off (ATO) system for sumpless aquariums

• Model: Sumpless ATO2

• Sensors:

  • Dual optical sensors (primary + backup for overfill protection)

  • Quick Security Technology (QST) for abnormal condition detection

• Pump:

  • Compact DC ATO pump

  • Max head: ~8 ft (2.5 m)

  • Flow rate: ~74 gph (280 lph)

• Power Adapter:

  • Input: 100–240 VAC, 50–60 Hz

  • Output: 12 VDC low-voltage operation

• Mounting:

  • Magnetic sensor mount for rear chambers or display walls (up to 1/2" glass)

  • Pump and tubing easily connect to RO/DI reservoir

• Tubing Compatibility: Standard 1/4" tubing (included)

• Use Environment: Freshwater and saltwater aquariums

Key Features

• Designed for aquariums without sumps—perfect for AIO and nano tanks

• Dual optical sensors with built-in backup for precise level control

• Automatically tops off evaporation to maintain consistent salinity

• Compact, quiet DC pump included for smooth and reliable operation

• Plug-and-play setup—no calibration or programming needed

• Quick Security Technology (QST) prevents overfilling and detects pump or sensor faults

• Complete kit includes controller, dual sensor, pump, power supply, tubing, and mounting hardware