I have started the process of converting from baquacil to chlorine ..... last week actually...... it quickly became apparent that none of my former means of water testing were adequate since none would read FC above 10 ppm....... so I ordered the TF100 as suggested on this site. I received it promptly !! That was Friday and we had added about 7 96oz jugs of bleach a day since MOnday..... still getting no more than a reading of 10ppm at any given time when using our Aquacheck system which claims to read up to and including 15ppm......... my real problem started Friday night when I used the TF100.... I took the required sample of water from my pool, added the powdered additive , it turned pink then went absolutely clear again without adding a drop of solution...... I tried this three times and the water would not stay pink long enough for me to add the drops......so I waited until next morning.......did it all again.......this time the solution stayed pink but took 64 drops of solution in order to return it to clear....... I do not believe there is any way my FC was at 42 ppm since when the process was started one week ago, the water was a lovely shade of slime green.........it has since turned several other colors, none of which are clear !! I am afraid to continue to add chlorine and do not know what these test results mean...... why would it not stay pink before adding the drops to neutralize it? and why , less than 12 hours later would it say that there was 42ppm ? We have cleaned our cartridge filter every other day, always covered with a nice green, yellow, tan slime...... there is obviously consumption of the Baq as well as the algae because the smell of chlorine from the CC s is strong...... not offensively so but noticeable in the air ......which way do I go from here......I can not get a logical level on my FC, do not know when to add bleach and when not to.....I feel like I have wasted a week and a ton of bleach to get no where......please advise