pool math FC levels different than recommended levels

[jarcher89]

Why is it that in my pool math the recommended levels of FC are lower than the recommended levels here--> Recommended Levels - Trouble Free Pool?

 

[ajw22]

Did you set your pool type in Pool Setup? Gear icon in upper right.

 

[jarcher89]

Yes. It is set at 20,000 gallons,vinyl liner

 

[mknauss]

You have to enter your test results. The CYA is needed to get a FC target range.