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Rainwater harvesting

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A Kandua professional can calculate your roof's exact potential. You can collect approximately 1 litre of water for every 1 millimetre of rain that falls on 1 square metre of your roof.

For potable use (drinking), the water must pass through a multi-stage filtration process, including sediment filters, carbon filters, and a UV sterilisation unit to eliminate pathogens. For homeowners in Cape Town, no, not without proper treatment.

A professionally installed system will include a backup connection to the municipal supply. An automatic or manual valve ensures you can switch to the municipal grid when your tank is low.

Signs it needs cleaning include discoloured water, a foul odour, or a significant build-up of sediment. For homeowners in Cape Town, every 2 to 5 years, if you have good pre-filtration.

A comprehensive, whole-house system might take several days to a week. A basic garden system can often be done in a single day, and this is especially relevant for Cape Town residents.