Hi. I know I need to drain and refill but my question is how much of the pool can I drain without jeopardizing the liner? It's only a year old & is in fine shape. Not sure if this is the correct forum but it's chem balancing so I figured I'd start here. My water softener broke when I started to fill the pool last year. I have very hard water so the calcium hardness is super high (> 600 if I remember correctly from last season). I replaced the water softener (after the pool was filled). Now I'd like to get the level of CH down. I assume I should do it on a nice sunny day but is that even necessary. Not opening the pool for a while but want to know what to plan for.