Purchase your rainwater tanks from reputed brand, and have it installed by a licensed plumber. All the tank fittings, pipes, filters and other accessories should be installed properly and should be of high quality.
Keep your tank free of litter
Clean out all debris, leaf litter, and grit that might be blocking your pipes. Clean the inlet mesh regularly and install a first flush diverter between the tank and the house water pipes to prevent any clogging.
Replace important parts
The inlet strainer and pump and filter cartridges are essential in keeping your tank water clean and grit free. Check and clean these regularly and replace them every few months depending on use. Use a pump cover to protect the pump and to reduce noise.
Sludge build-up inside the tank can cause your water to become putrid and have an unpleasant smell. This happens when the tank has not been flushed out with fresh rainwater for a long period, or the bottom of the tank has a sludge build up that has not been cleaned.
Make it a habit to clean the bottom of the tank every two-three years. This includes any filters or strainers fit at the bottom of the tank which can be a potential growth habitat for microscopic anaerobic organisms.
In the dry weather, sometimes the local water supply is interrupted for a small period of time. When faced with water crisis, the water tanks can be of immense help to you. They will provide you the water that is very much needed for things like washing, gardening and cooking.