1. Gutters are installed with a downward gradient of 2 degrees towards the downpipe 2. Downpipe with self-cleaning grate that removes leaves and debris 3. Pipe bend which transports water around corners 4. Pipe from downpipe to tank, sloping so as to prevent standing water 5. T-pieces connecting pipes from other parts of the house and which connect to the First Flush Diverter 6. The First Flush Diverter that diverts the initial volumes of rainwater and ensures that the roof is clean before water is harvested for storage 7. Tank with level-gauge, calibrated to the size of the tank 8. Installed tank with cast foundation 9. Onward distribution with pressure-pump, cartridge filter and UV disinfection unit that automatically maintains a constant pressure in the supply pipes