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IrriGRAY pumping control system

Graywater is sticky stuff. It plays havoc with small floating sensors, especially if they are mounted on a vertical rod.

Also, GFI's (which are required in many US States) create electrical spikes in the system power supply, and can cause reliability issues with the electronic controllers.

For this reason we design our system with a single pump float switch, modified so the float has a very low activation level.

A lower trickle valve is fitted so graywater can slowly drain down to the 2" level (accepted by the vast majority of jurisdictions). A bottom trickle valve can also be fitted to completely drain the container.


By using trickle valves, the IrriGRAY collection container does not require electronic controllers nor water sensors. This enables affordable system pricing without compromising pump quality, the key to system longevity and return on investment.

If a full port lower drain is required by your local jurisdiction, the a Lithium Ion powered irrigation valve with built in 24 hour timer can be used. The timer should be set to open at say, 2 am for 5 minutes. This fulfills more demanding code requirements while minimising water loss.

Jurisdictions requiring these valves also require the container to be self draining without pump power, so height / depth / gravity drain issues are not cause by the valve installation, they are caused by the overall drainage code in place.

Detailed description of electronic sensors and 24 hour timers:

Electronic 24 hour control systems generally include 2 water level sensors and a 24 hour based computer chip controller.

The first sensor might be positioned 8" above the base of the container (height is dependent on the system design).

The second sensor might be positioned 2" above the base of the container (again dependent on design).

During normal operation, the pump turns on when the upper sensor is activated, and then turns off when the lower sensor drops, making sure the pump has a decent 'burst' of water it can send out.

In some jurisdictions less than 8" but more than 2" of graywater cannot be stored for more than 24 hours. So early designsof graywater systems included a timer control so that if the lower valve had not sensed a water drop over the last 24 hours, and indicated that there was still at least 2" of water in the container, would activate until the lower sensor dropped.