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Back to Construction manual for the Bathroom Toilet unit

6. Prepare for composting: build the sub-structure with two cellars under the slabs

With the two slabs and the gutter ready for assembly it is easier to decide where the actual place of use will be situated, in the house of near it. Now decided for composting of the excreta or for collecting them in a deep pit.
For building preparations for the construction of the composting cellars a related chapter "Composting cabins" will be added soon. Such a double composting cellar is known from sanitation projects in Vietnam and India.
A drain has to be made for the water used in the bathroom, also containing the urine of its users. This spill water could also be collected as fertilizer. It contains essential agricultural nutricians. However prevent stink caused by open collection of urine.