The second year of owning a pool and it has by far been perfect for maintaining the water. I have hardly had to use any chemicals other than chlorine pucks and shock when needed.
My Calcium Hardness has been high though. I have pumped out about 1 to 1.5ft of water and replaced it with fresh but the PPM at the time was 550 and only dropped to 500. Currently it is at 650.
In pool school it refers to a reverse osmosis water treatment and the only system like that that I have heard of is the drinking water system which I don't have.
There is no chemical that I can use to lower the number?