I did not think I would have this issue since the tap water is about 350-400 expected to be filling regularly due to evaporation and thus have the CH going up, rather than down. CH has dropped to 275 due to alot of rain and splash out. I have only had to add a little water a few times.
Borates 20 (will be moving to 50 soon)
These numbers put my CSI at -.42. Pool Math gives a range of ideal range -.6 to .6, but all of the reading I have done in threads, I believe that -.3 to 0 is where it more the recommended range. Even so, if I add borates and the CH drops more, I am pushing closer to .6....
I have been pulling my TA down following the recommendations to add Borates where it says: "Before you start on borates, adjust your TA level towards the low end of the appropriate range for your situation." That would be TA of 60. I see though that TA has a large impact on the CSI.
Pushing my TA to 60 and borates to 50 would make the CSI -.59.
I am thinking to add 125 ppm of Calcium to get to 400, keep the TA at 70 and go ahead and add the Borates. This would put my CSI to -.29.
Am I on the right track with this?