TFP Web Pool Calculator Vs App Calculator

Jump to latest Follow Reply
R

Roadkill

0
Dec 20, 2015
9
Goodyear, Az
Pool Size
7560
Surface
Plaster
Chlorine
Liquid Chlorine
I have used the web pool calculator for several years, but most recently switched to the app calculator. A month ago I decided to compare the two calculators to verify the dose suggestion of one or the other calculators. I am surprised that the calculators do not provide the same test results when the same numbers are entered into each. So now I am not sure which calculator would provide the most accurate information. Any suggestions?
 
The discrepancy between the web calculator and the app calculator is realized in the CSI calculation. I apply chemicals with a zero CSI target. I also test and treat both pool and spa (a separate unit) every two to three days. The pool and spa test numbers interred in to the web calculator each have different different results when using the app calculator. The primary factor is the effect the PH value has on the CSI calculation. My confusion is the amount of acid needed to treat to obtain a near zero CSI. The two calculators provide different results. Which would be considered the most reliable to use?
 
Usually that CSI disparity between the APP and webpage is usually due to the salt level as I noted earlier. Did you confirm? For example, if you have no salt listed in your Poolmath logs, the APP includes it as a starting baseline, so you need to list 1,000 ppm of salt on the web calculator. That should change the CSI. Did you try that?
 
These numbers may seem high in some areas or low in others. Water was replaced last month and cold temperature insure that the pool will not be used for a couple of months. I maintain towards a 0 CSI.
Examples: Pool - Web. Pool - App
Test. Goal. Treatment Test Goal Treatment
FC - 2.5 4. 15oz - Bleach 12.5% FC - 2.5 4. 12oz - Bleach 12.5%
PH - 8. 7.56. 2.2oz Acid (32). PH - 8. 7.96. 0.5oz - Acid (32)
TA. - 78. 78. 0 TA - 78 78. 0
CH - 275. 275 0. CH - 275. 275. 0
CYA - 30. 30. 0. CYA - 30. 30. 0
Temp -51. 51. - Temp - 51. 51. 0
CSI 13. 0. CSI .04. 0

I realize these are small numbers for treatment requirements, but am surprised that the two calculators provide different calculations. Any recommendations for the best calculator for obtaining optimum results?
 
Even if you don't load any salt on the Poolmath APP, it's there (1,000). Already built-in because all pools inherently have some salt. So when you go to the web page and don't add it, the CSIs won't match. So as a test, take all of your Poolmath numbers and enter them on the webpage site. Then also add 1,000 for salt on that webpage. Then see if those CSIs match up better.
 
The calculating for salt brings both calculator nearer to alignment. I have always counted upon the web calculator as being the most reliable. So would you advise that I bring the app calculator into alignment with the web calculator? And if so what adjustment would you recommend?
 
The code is identical in the two. So just use one. I would suggest the app. It stores your data for historical review.
 

Enjoying this content?

Support TFP with a donation.

Give Support
Well, like Jim noted above, both should be quite close. When I'm helping people on TFP, I often use the Old Poolmath Webpage because I like the two columns to compare side-by-side. For my own pool though, I use the PoolMath APP. But they should both be very close.

I notice that you don't have your Poolmath logs available for all to view.. But if you post a full set of your latest results, we can compare everything as well.
 
Roadkill said:
Trying to figure out how to make my logs available for all to view....
Click to expand...
Gear Icon, upper right. Touch it. Scroll towards bottom. Sharing. Turn Sharing on.

You cannot measure a TA of 78.

No real need to maintain a tight rein on CSI. A range is fine.
 
One item to toss out there for you @Roadkill

On the webpage version of PoolMath, can you hit F5 to update your page. I suspect you’re viewing a very old code that has been updated. As Marty mentioned the math is the same for both currently. Only item that may slightly change is rounding. Working from memory one code rounds slightly different than the other, but for the life of me I can’t remember how 😂
 
I think my log sharing is on. I guess at the TA number if the test colors begin to change but have not fully made the cross over. I zero in on the CSI to avoid the white line at the water line. And to protect the pebble tech walls of the pool from too much acid. So, I am over thinking it?
 
Just keep your CSI between 0 and -0.3. That will cover your issues.

Your data is not shared yet. But may need some time to sync the systems. Click on your Member name as that is where the sharing shows up.
 
  • Like
Reactions: HermanTX

Enjoying this content?

Support TFP with a donation.

Give Support
You must log in or register to reply here.
Thread Status
Hello , This thread has been inactive for over 60 days. New postings here are unlikely to be seen or responded to by other members. For better visibility, consider Starting A New Thread.
Top Bottom
Back
Jump to latest Follow Reply