Flashing tape for Safe Water Harvesting
Around chimneys and other roof penetrations lead flashings are traditionally used to create a watertight seal, but if poorly maintained lead flashings can cause major problems for tank water systems. There are now some safer alternatives.provided the water is visually clear, has little taste or smell and the storage and collection is via a well maintained tank and roof catchment system.
https://wakaflex.com.au/wakaflex-waterharvesting/