Quote Originally Posted by robbym70 View Post
When the chlorine level holds over night without more than (help me here experts) __________ ppm loss than you can reduce the amount of chlorine in the water until you reach a suitable level to maintain clarity and cleanliness. After that it's a simple matter of adding the right amount of bleach at the right time to maintain the proper level for your pool. The proper level will vary based on your CYA level as documented in the best guess chart.
The missing number is 1. Keep the chlorine high until you lose no more than 1ppm of chlorine from sundown one evening to within an hour of sunrise the next day.

By the way, in a 24K gallon pool, each gallon of 8.25% bleach will add just about 4ppm of chlorine.

You definitely need to have him order a K-2006 kit. With a CYA reading of 100 (and it actually could be higher than 100 since the test cannot differentiate anything higher than that), you will have to run higher than normal chlorine levels per the Best Guess Chlorine Chart. (Link in my signature below.) He also needs to quit using any stabilized forms of chlorine -- meaning no more trichlor pucks and no more dichlor powder. Both of those will continue to add CYA and you don't want it any higher!

Run the pump 24/7 while you are trying to clear the pool and backwash whenever the pressure rises 8-10psi over clean filter pressure.

Repost if you have further questions.