Langilier Saturation Index? Same as CSI?

[JamesW]

TA - 70
PH - 7.6
CH - 200
CHLORINE 7.0
CCHLORINE 0.2
CYA 70

Water temperature?

Salinity or TDS?

 

[JamesW]

pH + Temp Factor + Carbonate Alkalinity Factor + Calcium Hardness Factor - TDS Factor = LSI

LSI and CSI are close.

7.6 + 0.7 + 1.7 + 1.9 - 12.19 = -0.29

 

[JamesW]

Ask your builder if they will accept the CSI from PoolMath.

They should not have a problem with it.

 

[Kathleen2252]

Thanks.
Very helpful.
I have posted my values since I cannot share logs at this time.
I am trying to raise the CSI to a positive.
What can I adjust?
Thank you.

Water temperature?

Salinity or TDS?

Water temp is 84
New plaster so using liquid chlorine for past 3xweeks.
Will be converting to swg next weekend
Water is new ( from city)

 

[Kathleen2252]

Ask your builder if they will accept the CSI from PoolMath.

They should not have a problem with it.

My builder told me they didn't need logs but it was verbal

 

[JamesW]

I would allow the pH to rise to about 7.8 and maybe add some calcium to get to about 300 ppm calcium hardness.

Do not increase the pH, it will rise on its own.

 

[JamesW]

When you add salt, that will lower the CSI.

If you go to a pH of 7.8 and a CH of 250, that will bring the CSI to about -0.2, which is fine.

 

[Kathleen2252]

Thank you for your help.