Mabvuku and Tafara are high-density suburbs facing the problem of water scarcity. Households source water from shallow drying wells or boreholes and use buckets for flushing their toilets. Water table is reseeding because more than 90% of Harare is using underground water. Old Mabvuku settlements use sewer systems with numerous blockages and overflows, polluting drinking water reservoirs and underground water. Waterborne diseases are frequent. Existing septic tanks and linear sewer systems lock carbon and nutrients in human excreta. This locking up cause agroecological imbalance because they are not returned to soil. Zim Earthworm Farms developed a Jati Decongester Sanitation System, a patented device which is installed outside the toilet. When you flush, your solids are trapped and processed by earthworms in the decongester; only wastewater leaves the decongester for further treatment to a state that allows it for reuse in flushing toilets or irrigation. Decongester will be installed at houses before the manhole that will trap solids and allow water to flow, hence preventing blockages. Water will be connected to the main sewer using saddles. The innovation does not allow underground water contamination. After 3-4 years the solids trapped in the decongester are harvested and mixed with cured compost for further processing in a patented Jati-earthworm Breeding Composter into biofertiliser.