Test at least once a month for a maximum range of 1,500 to 2,000 ppm. Metals (copper, iron, manganese): Test if you see staining in your pool or if you suspect the water has been exposed to metals.

You can use either pool testing strips, such as the PoolTime 6-Way Test Strips, from The Home Depot, which are super affordable and quick to use, or a more reliable Digital Water Testing Kit from ...