How long to wait to retest after adding chemicals?

[aylad]

With chlorine and acid, I wait 2-3 hours. However, like Watermom says, CYA can take up to a week or so. Also, you need to make sure that you don't backwash the filter in that time, otherwise all the CYA will just be washed out and you'll have to start over.

Janet

[mwsmith2]

Here's another vote for CYA = 7 days, other chems 3 hrs.

Michael

[mshumack]

Thanks for all the replies.
Michael - perhaps you could/should add this info to the help section in your BleachCalc program.

[mwsmith2]

I'll do that...right after I write the help section!

Michael