For detailed installation instructions, visit the Support page for your chosen auto tank vacuum.
For polyethylene tanks, you can install your auto tank vacuum when your rainwater tank is full. For concrete tanks, you can install your auto tank vacuum when the tank is full if there is an access hole adjacent to your tank overflow outlet. If there is no access hole adjacent to your tank overflow outlet on your concrete tank, you cannot install the auto tank vacuum when your tank is full.
Refer to instructions for installation method.