What does mains top-up mean?
In order to ensure water quality, rainwater tanks should not be allowed to run dry. Most rainwater tanks, especially ones that are plumbed into the house, are topped up with mains (drinking) water. This ensures that there is always water available to flush toilets and wash clothes during long periods without rain. Because the rainwater tank will be supplemented with mains water when levels get low, you may still be subject to water restrictions if they apply in your area. Contact your local water utility to check the water restrictions in your area and restriction requirements for rainwater tanks with mains top-up.
