Chlorine/CYA question

[AimeeH]

Maybe I'm misinterpreting somewhere but asking for clarification. Saw algae yesterday.....need to shock/slam pool. I don't need help with that process...got that thanks to TFP . :-D

CL/CYA chart says shock value for SWG is 28 with cya of 70
Poolcalc says 20 with cya of 70

Why the difference?

 

[duraleigh]

Use the chart...it'll speed the process a bit.

 

[woodyp]

That's a topic currently under discussion by the forum operators to reconcile those. Use the 28 and you'll be just fine.

 

[AimeeH]

Thanks.