A metal found in some algaecides and most “mineral systems” that can cause green, gray, or black stains on the pool surface and also occasionally tints the water a brilliant clear transparent emerald green. Copper can also get into the water if you have older copper popes or if your gas heater has copper heat exchanger and your pH goes below 7.0 for an extended period. If you have copper in the water you will often need to use a sequestrant to prevent stains from forming. Copper stains can be especially difficult to remove.
Copper
Updated onUpdated on Oct 25, 2020 at 11:57 AM
