I have put 4 pounds of CYA in my 14000 gallon above ground pool and I am still only getting a reading of about 15 when I test it. (I put in 3 pounds, waited 5 days tested, then added another pound, waited 5 more days and tested again.)
I had a cheaper test kit, but received Ben's kit this weekend and it is still testing low. Is 30 seconds enough after I mix the solution to get an accurate test?
The water is crystal clear and I am only using about 3 quarts of bleach every couple of days (sometimes more, but it is in the high 90's - 100 here). I'm keeping that level at 3ppm.