Treatment level (example system)

Sub-surface trench

Sub-surface irrigation

Above ground drip irrigation

Above ground spray irrigation

Toilet flushing

Cold water laundry washing

Primary (traditional septic tank)

√

×

×

×

×

×

Secondary (ATU or GTS)-without disinfection

√

√

×

×

×

×

Secondary with disinfection, blackwater (ATU)

√

√

√

√

×

×

Secondary with disinfection, greywater (GTS)

√

√

√

√

√

√