Rainwater harvesting is collecting your roof water and saving it, using this resource to drink or irrigate your property instead of sending it down the drain.
Rainwater harvesting has been traditional in the rural environment and is now becoming popular for domestic residential use. This ranges from the smaller hobby size using a 300 litre tank and one single down-pipe for garden use (very economical to set up giving great benefits); to more sustainable stand alone 5000 litre or more systems for building use, requiring filtration and backflow protection to meet council regulations. These need to be sized correctly to formulae to ensure smooth running all year around. This enables complete independence from council supply.
We are able to fit these systems and there are many options available. They become more viable for whole home usage when the storage is 25000 litres or more, especially with our uncertain weather climate. Incidentally, prior to last year's drought some of our clients elected to fit 50 000 litre storage tanks and did not run ot of water during the drought, these tanks take only three days of rain to have them full again.
The apropriate filtration is definitely required by council to ensure safe drinking water. This usually is a minimum of twin cartridge filters of a maximum 1 micron rating with a UV light to kill any possible gardia, this really is the minimum and there are additional options to remove ions from water and improve taste.