The "shotglass" method is here: Take one part pool water and one equal part distilled water and mix these together. Run your test with this water and then multiply your result by 2. If that doesn't take it high enough for you to get a reading, use one part pool water and two parts distilled and then multiply by 3, etc. (The dilution method does lose accuracy with each dilution but it is better than nothing when you have no other way to get a reading with such a high cl.)


This will help you force your kit to test higher chlorine numbers than 5 ppm. I agree with Watermom, if you've already replaced 1/2 your water and STILL have a CYA of 100+, there's no telling how high it actually was. Rather than drain it all, just drain another 1/3-1/2 like Watermom suggested, just to drop it down into manageable ranges.

Or, as an alternative, you can just run your normal chlorine no lower than 8 ppm, staying in the 8-15 ppm range. It's hard to do, though, consistently.

I absolutely would not use anymore trichlor pucks or dichlor to shock--definitely only bleach if it were my pool!!

Janet