Quote Originally Posted by mas985
Tracy,

If you can post the PH, Alk, Temp, Ca and salt level, I can give you the SI. To learn about it yourself, Google: "Langelier saturation index" for more information.
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Hi, Here are my numbers. I was up around 10 for Cl but now everything is clear and the numbers were maintaining PM to AM so I'm starting to let it come down. Anyway:
Cl: 5
PH: 7.8
CYA: 30
Alk: 110
Temp: varies in this climate but 55 right now
Ca: none showing up
Salt level: 100 - just starting to add salt now that everything is stabalizing so this number is in flux.

Question about the LSI - if some of it is based on Temp. and that's so variable in an outdoor pool - how is it possible to keep the ideal saturation? It's 55 in the pool now and although we are not using the heater yet, it would be 80 or so running through the heater. Doesn't that just blow that variable away? Or is my logic off?

One more question: the ranges I'm seeing on test charts is 200 to 400 for pools. Should I be in the range or is that what is recomended for non-vinyl pools? Michael, you said 150 is fine. May I ask why 150 and not 200? I don't want to damage my heater, but I also don't want to waste money adding more calcium than I need.

Thanks for your help! It's been such an education. I feel like the mad scientist lately!!

-Tracy