We also recommend a controller such as the Davey Rainbank which automatically selects the water source you draw from, with rainwater given priority over mains supply. Mains water will be supplied when the tank is empty or in the event of a power outage.
Although collected rainwater is generally very good in regards to mineral and chemical components, it is in MOST CASES contaminated with microorganisms from faecal matter of birds, possums, cats, mice and rats.
If you want to use your rainwater for everything including drinking then the Ministry of Health recommends a two-barrier approach to this – namely, filtration followed by disinfection. Although we can provide a number of solutions that suit your requirements, the simplest solution is for cartridge filtration followed by ultraviolet disinfection. You can find out more about the three stages of filtration here.
Take a look at how the Davey Rainbank EVO works and how easy it is to install.