CSI result in Pool Math online vs Pool Math Android APP discrepancy??

Helipil0t

New member
Aug 15, 2018
1
London
I'm I the only one getting different results using different apps? I've tried 4 different apps with the same inputs.
My pool tests as follows:

FC: 4.4
CC: 0.0
pH: 7.5
TA: 100
CH: 300
CYA: 35
TEMP: 68 F

Pool Math online gives me a CSI of -0.06 (which I believe makes sense given the above numbers). Pool Math Android app gives me a CSI of 0.54. poolcalculator.com online gives me a CSI of -0.06 (consistent with Pool Math online) and of course poolcalculator.com's Android app gives me a CSI of 0.68. What's the deal? Am I missing something simple here? I'm hoping someone can shed some light on this discrepancy.

Thanks for the help.
Sean

P.S. I'd prefer to keep using Pool Math to help support the community.
 

Leebo

Admin
TFP Expert
LifeTime Supporter
Jul 21, 2011
8,934
Eastern Ohio
First and foremost........welcome to TFP!! TFP has zero control over the PoolCalculator.com website, and honestly we don't trust their readings. If I may suggest one thing, ditch that link. :D

I see you're oversea's, did you change the "units" on either the App or the webpage calculators to liters???? Make sure they're both the same.
 

jseyfert3

Well-known member
Oct 20, 2017
253
Janesville, WI
I'm I the only one getting different results using different apps? I've tried 4 different apps with the same inputs.
My pool tests as follows:

FC: 4.4
CC: 0.0
pH: 7.5
TA: 100
CH: 300
CYA: 35
TEMP: 68 F

Pool Math online gives me a CSI of -0.06 (which I believe makes sense given the above numbers). Pool Math Android app gives me a CSI of 0.54. poolcalculator.com online gives me a CSI of -0.06 (consistent with Pool Math online) and of course poolcalculator.com's Android app gives me a CSI of 0.68. What's the deal? Am I missing something simple here? I'm hoping someone can shed some light on this discrepancy.

Thanks for the help.
Sean

P.S. I'd prefer to keep using Pool Math to help support the community.
I downloaded the app to double check your numbers. I got -0.06 on the web version and on the app, using gallons on both. Then I switched the app to liters, and though it doesn't call it out, when you do that the temp switches to °C automatically. So entering 68° when the units are liters gets you a CSI of 0.54, because it's °C. Entering 20 °C, the equivalent of 68 °F, brought the CSI back to -0.06 to match the other results.

Leebo, since you're here, a suggestion is to list the units of temp on the app so this doesn't catch other people off guard?