A practical guide from the team at Puranmal Sons & Ceramix Syndicate.
A common planning figure for domestic use is roughly 135 litres per person per day. For a family of five, that's around 650–700 litres a day for normal use. Your tank should comfortably cover at least a full day's needs, with a margin for guests and supply interruptions.
For a typical home, size the overhead tank to hold about one day of usage, and an underground sump to hold two to three days as a buffer against supply cuts. So a family of five might use a 500–1000L overhead tank with a larger underground sump. Larger families and buildings scale up from there.
Overhead tanks supply water by gravity and are easy to install; underground tanks store larger volumes and protect against supply interruptions but usually need a pump. Many homes use both together.
Look for multi-layer tanks with a UV-resistant outer layer and an anti-bacterial inner layer to keep water clean and the tank durable in the sun. Tell us your family size or project details and we'll recommend the right capacity and type.
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