OK thanks. When you get your own test kit, assuming it's a FAS-DPD test like the one Ben provides, then you will be able to test even high chlorine levels. Just so you know, even the pool store would be able to determine your high chlorine levels if you give them diluted samples of your water, say diluted 4:1 using distilled water which means 1 part pool water plus 3 parts distilled water (tap water would probably also be OK since you would be checking only for extraordinarly high chlorine levels, but tap water will likely either have some low levels of chlorine in it or slightly higher levels of monochloramine which reports as Combined Chlorine, but still wouldn't be more than a few ppm). You would then multiply whatever reading they give you by 4. This isn't super accurate, but is still better than nothing.