I’ve noticed a discrepancy in CSI between these two within the normal range slightly below and above zero. For example if Pool Math gives me -0.15, the Taylor circular slide rule gives just a hair above zero for the same set of parameters. So which one to believe?
Pool Math and Taylor calculator Don’t Agree on CSI
- Thread starter Miniguy77
- Start date
- May 3, 2014
- 58,522
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
They are not the same thing. Poolmath uses CSI - Calcium Saturation Index (CSI) - Trouble Free Pool
Taylor thing uses SI, which is from Steam Boiler days. Outdated.
Taylor thing uses SI, which is from Steam Boiler days. Outdated.
The Taylor uses "adjusted" alkalinity.
Subtract 1/3 of the CYA from the TA before using the Taylor calculator.
Subtract 1/3 of the CYA from the TA before using the Taylor calculator.
- May 16, 2018
- 23
- Pool Size
- 15301
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Turbo Cell (T-CELL-5)
I am wondering the same thing. I have used Taylor SI for a while with no problems. When I look at the Pool Math CSI I am -.6 which is bad in my book. So if I adjust to max out CH to 320 and TA to 80 with my PH from 7.2 to 7.8 it still puts my CSI pool Math from. -.58 to -.10 my pool looks great but definitely don’t want it to be that corrosive. Chlorine is more effective on the lower side which puts me way negative. What do I do at this point when I am maxed out on TA and CH? I want to go by pool math especially if Taylor SI is outdated. Any input is greatly appreciated.