Rainwater Harvester Beware!
Rainwater can dissolve heavy metals and other impurities from the roofing materials of the catchment all the way to the faucet, including storage tank. Rainwater lacks minerals, but some minerals, such as calcium, magnesium, iron and fluoride, in appropriate concentrations are considered very essential for health. By adding mineral to the catchment and storage tank, the ph of the water is raised, making the water less acidic.
Acid Rain Mineral Packs contain calcite (calcium carbonate) and corosex (magnesium oxide). When added to a catchment tank in a pool float, these minerals are gradually absorbed into the water as needed. And because the water only absorbs what it needs, the Acid Rain Mineral Pack can last for 6-9 months in a 10,000 gallon tank.