The Reef Angel Multi Water Expansion features four independent channels, allowing you to precisely monitor your sump, display tank, ATO reservoir, or virtually any other water source.

Our water level sensors contain no mechanical components. Instead, they use hydrostatic pressure to reliably and accurately measure water levels from 0–100%, eliminating common failure points found in float switches.

Example Uses

• Implement a reliable ATO — no mechanical float switches that can be easily triggered or blocked by snails

• Automatically shut off return pumps to prevent overflows

• Disable ATO pumps if water levels drop too low, preventing dry runs

• Set up automatic water changes

• Receive alerts for any abnormal water level conditions

Features

• Pressure-sensitive sensor (no mechanical sensors or moving parts)

• Up to 18 inches of measurement range

• Uses standard 1/2″ PVC pipe to measure water level

Note: Only one expansion module can be connected to your system without an Expansion Hub.