Aiming for the target FC

[JohnA902]

Following the TFPC method, assuming the CYA is accurate, let's say the CYA FC ratio says the target FC is 5ppm. Is it bad to aim for 6ppm? Today I lost 3ppm of chlorine. 0 CC.

Target says 5ppm, I just added bleach to 6ppm, assuming tomorrow it will drop another three so at least I'm near the target for the most of the day tomorrow.

Anything wrong with with that line of thought?

John

 

[Richard320]

I think you've mastered the theory of FC range.

You target high enough to keep you above minimum until you next replenish. So if you're losing 3 every day and minimum is 3, you target 6.

 

[JoyfulNoise]

The FC/CYA ratio establishes a MINIMUM, or floor value below which you should not let your water sit for any long period of time. The FC/CYA ratio for manual bleach chlorination is 7.5%. For SWG pools, it's 5%.

You need to add enough chlorine each day to stay above this minimum value.

 

[pooldv]

Nope, you've got it. And aim for 7 or 8 if you have a bunch of people swimming. It is safe to swim with FC above minimum and up to shock level for your CYA. Chlorine CYA Chart. Yes, we swam for two weeks last summer with CYA at 70 and FC at 28. Nobody even noticed.

 

[JohnA902]

Nice. Thanks!