Calcium Hardness

Calcium Hardness is important because it PROVIDES stability in YOUR POOL, without it, insufficient levels may cause corrosion to the pool equipment & liner !

More Info here !; https://www.eztestpools.com/.../calcium-in-your-pool-does... ( article; background info regarding calcium)

Info regarding; https://www.swimuniversity.com/calcium-hardness/ ( how to balance the calcium hardness)