How do i fix Smelly rainwater tanks?

To fix smelly rainwater tanks, first, clean the tank thoroughly by removing any debris, algae, or sediment. Use a mixture of water and vinegar or a specialized tank cleaner to scrub the interior surfaces. Ensure that the tank is properly sealed to prevent contamination and install a first-flush diverter to minimize debris entering the tank. Regular maintenance, including periodic cleaning and checking for leaks, can help prevent odors from returning.