This tank is the first stage of the 'brown water' treatment, where the waste from the toilets breaks down and relatively clean water is then drained off into and adjacent 40 foot deep leach pit.
Our 'grey water' from basins, shower and bath, will go through a separate system of gravel and sand drains that will be used to water the roots of plants and veggies in the back yard. The idea being that by filtering the grey water and avoiding applying it directly to the plants we reduce any possibility of contamination.
The kitchen waste water will be going through its own separate sand filter and probably won't be applied to crops to further reduce contamination worries.
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Adam
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