imwarren said:If you have been adding the same amount on previous you could probably keep adding that amount
I would maybe wait a little longer between doses or and a little Less then the last dose to keep from over dosing that should keep you for a day or so as to not go backwards.
imwarren said:Tftestkits.com is were I get all my reagents
Fast and best value
frogabog said:The pool itself is safe up to mustard shock level. I'd keep adding same as you have been today. If the reagent will be there tomorrow, it's unlikely you'll dose past mustard shock level in one day.
frogabog said:Half an ounce isn't going to make or break much of anything. I'd just stick with 18oz for simplicity sake. My point was that if you keep up the same or similar dosages/times today it's unlikely that you'll overdose the pool. Mustard algae shock level is significantly higher than normal shock level, yet still safe for your pool. You have room to err on the side of caution today.
If you run out of reagent completely, you can try diluting the OTO (yellow chlorine) test to check, but at 20ppm you'd have to dilute it by 3 parts and the accuracy of such a dilution is suspect.