I have a newly built inground plaster pool. Its been filled since Jan 15. My CSI is currently at -0.42. I was wondering if I should add some calcium chloride to get my CSI somewhere between 0 and -0.3.
Here are the tests results from my last log
FC - 5.0
PH - 7.4 (a little low, but have been lowering and aerating trying too lower my alkalinity for borates)
TA - 70 (this was my target....have been working it down from 100, adding borates today)
CYA - 40 (going to add a little conditioner this weekend and shoot for 50)
CSI - -0.42
If I brought my calcium hardness to the top of the recommended range of 550-650, it would bring my CSI to a level of -0.27 to -0.34. If I am correct in my understating of pool chemistry, the calcium stays in the pool as the water evaporates. So my current level of 450 should theoretically stay the same all season. And as I add more water to compensate for the lost pool water, that hard water contains calcium as well. How much, I am not sure. So I am unsure how much extra calcium my pool will gain throughout the season with top-offs. What would you do.....leave it, or add a little calcium?
Here are the tests results from my last log
FC - 5.0
PH - 7.4 (a little low, but have been lowering and aerating trying too lower my alkalinity for borates)
TA - 70 (this was my target....have been working it down from 100, adding borates today)
CYA - 40 (going to add a little conditioner this weekend and shoot for 50)
CSI - -0.42
If I brought my calcium hardness to the top of the recommended range of 550-650, it would bring my CSI to a level of -0.27 to -0.34. If I am correct in my understating of pool chemistry, the calcium stays in the pool as the water evaporates. So my current level of 450 should theoretically stay the same all season. And as I add more water to compensate for the lost pool water, that hard water contains calcium as well. How much, I am not sure. So I am unsure how much extra calcium my pool will gain throughout the season with top-offs. What would you do.....leave it, or add a little calcium?