Just some background, I have an 18 month old plaster pool in Las Vegas where we have hard water. I'm getting the PuriPool process done on my pool soon because I'm tired of looking at the stains on my tiles. My CH is currently at 700. Now I'm assuming the puripool process is going to set me back to zero or at least low enough on calcium where I'm going to have to add some back. I'm thinking that I want to set it as low as possible because my autofill is just going start adding back calcium on day one and I'd like the keep the levels low for as long as possible. Is it realistic to think that R/O is going to remove that much calcium, and if so what level should I target when adding back the calcium?