TMC Optical Auto Top Up (ATO)

What It Is

The TMC Optical Auto Top Up automatically replaces water lost through evaporation. Its infrared sensor monitors the water level and activates the included pump when a refill is needed.

Why We Like It

Small, regular top-ups save a daily job and help limit evaporation-related salinity changes in marine aquariums. The compact sensor and pump are useful where space is tight, including smaller sumps and rear filtration chambers.

The kit includes the pump, power supply, hose and installation fittings. Just add a suitable freshwater reservoir.

Key Specifications & Features

• Optical level sensing: infrared sensor with three detection points.
• Magnetic sensor mounting: simple positioning at the required water level.
• Dry-running protection: helps protect the refill pump.
• Maximum pump flow: 280 L/h.
• Maximum head height: 2.2 metres; flow decreases with lift.
• Maximum power: 4W.
• Pump voltage: 12V DC.
• Hose: two metres of 6/9mm tubing included.

WhatÕs Included

• Optical sensor with magnetic mount
• DC refill pump and power supply
• Two metres of top-up hose
• Anti-siphon valve
• Hose securing clamp and instructions

Reservoir sold separately. For marine aquariums, replace evaporation with fresh RO water, not saltwater. Install the hose and anti-siphon fitting according to the instructions.