Water hardness / calcium
Most pool technicians believe that adding a ‘calcium hardness reducer’ will permanently remove calcium buildup in pool surfaces. That is simply not the case because the calcium isn’t actually physically removed from the water with these treatments. What is actually happening is that they work by using chemicals to bind up (or capture) the calcium temporarily. Once the chemical has worn off, then the calcium in simply released and the levels will return to the previous calcium hardness level.
While these treatments do reduce the effects of high calcium in the short term, after 4-6 weeks, the ‘reducer’ chemical is completely neutralized and broken down. A complete waste of time and money. Remember, these products will not remove calcium buildup in pool surfaces.