Start with the right collection setup

A collection tank gathers the selected greywater before treatment. WCTNZ® favours commercial-sized GreyFlow buffering and primary filtration, with capacity selected for busy periods and returned process water. The right size depends on the installation, not simply its headcount.

The M800sx controller manages pumped transfer into the cabinet, subject to its 20 L/min instantaneous inlet limit. Routine membrane backwash and excess process flow return to the primary buffer in the described arrangement. The installation drawing confirms the feed and return connections.

Kitchen and dishwasher water may be included with suitable loading and grease/solids pretreatment. Toilet waste, toilet leachate, industrial process liquids, roof runoff and wastewater not selected for reuse remain separate.

Find room for the equipment—and the people servicing it

The M800sx cabinet measures 1,100 mm wide × 720 mm deep × 1,800 mm high. Allow 800 mm in front, 500 mm on the right and 500 mm overhead, plus a suitable base, restraint and access for removing components. Larger systems have their own layouts.

Keep collection lids, filters, tanks, pumps and waste-removal points accessible. The installation team also considers operating weight, flooding, noise, weather exposure, traffic, security and safe electrical isolation.

Getting the treated water where it needs to go

The M800sx transfers treated water into an external tank. A separate pressure pump delivers it to the selected toilets, washing machines or irrigation system. The cabinet’s transfer pump is not intended to provide that pressure supply.

Tank size and pumping equipment are chosen around the water collected and the way it will be used. The design can prioritise a preferred use and manage surplus water, while providing suitable turnover, reserve and fault protection.

Drinking water, rainwater, untreated greywater and treated reuse water remain clearly identified and appropriately separated. Any backup connection needs the specified plumbing protection, not a temporary hose.

What happens to overflow and cleaning water?

Routine return flow stays within the collection and treatment system. Accumulated solids, tank wash-water and membrane-cleaning liquid need their own servicing arrangements, separate from raw bypass and surplus treated water.

Both manual and automatic filter cleaning produce waste. Agree where it will go, whether collection or removal is needed and what the receiving system will accept, including cleaning chemicals and any required testing.

Start with a proper handover

Use appropriately authorised practitioners for plumbing, drainage and electrical work, together with personnel trained for the treatment equipment. Your installation team checks the combined equipment, connections and controls against the approved drawings and matching technical documents.

Keep the manuals, WCTNZ supplement, as-built drawing, equipment details, approvals, commissioning results and service contacts together. Startup and Handover explains what to cover before routine reuse.