D-D Flood Guardian – Automatic RO/DI Shut-Off System

D-D Flood Guardian – Automatic RO/DI Shut-Off System

Never Forget Your RO Water Again!

Take the worry out of producing aquarium water with the D-D Flood Guardian, an intelligent electronic shut-off system designed to help prevent overflowing RO and RO/DI water containers.

Simply position the magnetic optical sensor at your desired water level. When the reservoir fills, the Flood Guardian automatically closes its solenoid valve, stopping the incoming water supply to your RO membrane.

Ideal for reefkeepers who regularly prepare purified water for aquarium top-ups and saltwater mixing.

Key Features & Benefits

• Automatic water shut-off – Helps prevent overflowing RO reservoirs.

• Dual optical sensor – Provides additional protection against overfilling.

• Magnetic mounting – No drilling or permanent modification to your container.

• Electronic solenoid valve – Automatically controls the RO water supply.

• Easy to reposition – Move the sensor between suitable containers.

• Clear status indicators – Monitor operation directly from the controller.

• Compatible with ¼" RO tubing – Suitable for many standard RO/DI systems.

Convenient RO Water Production

Unlike traditional float-valve arrangements, the Flood Guardian allows you to fill a reservoir to a selected level before stopping production.

It can also be used with a suitable external timer to schedule larger, less frequent filling sessions, potentially reducing repeated short RO production cycles and associated TDS creep.

Installation & Compatibility

The magnetic sensor mounts to suitable reservoir walls up to 12.7mm thick. The supplied solenoid valve connects to compatible ¼" RO tubing.

Important: The manufacturer does not recommend this model for use with RO booster pumps.

For a complete water purification setup, explore our RO Systems, Replacement Filters, TDS Meters and RO Tubing.

D-D Flood Guardian – convenient automatic protection against accidental RO water overflows.