Retested chlorine with HTH OTO this evening. Straight pool water said 4, 5 parts distilled water to one part pool water, almost-maybe-kinda-sorta, looked like 3.75 (probly 4). If pool water was really 4ppm, then 5:1 should be VERY light shouldn't it? AND if 5:1 was reading close to 4 on the scale, that would make the pool 24ppm and the straight pool water should test VERY dark yellow or orange? My "chemist" is confused also. I feel pretty confident that the chlorine is somewhere between 4 and 30 ppm, but I'd not be surprised if it was higher. I looked up how many jugs of bleach we actually bought. So far this year 13 121 oz jugs of 8.25% chlorine have gotten into what is now a pool that started this year as the "swamp thang". I did not add chlorine today.