I ordered (and received) my TF100 test kit. I was under the impression that it was to come with a control sample of 50 CYA water so you could make sure you were performing the test accurately. I did the test anyway and got something well over 100. I then diluted by half as others have stated on here and think I'm getting something between 80 and 90 which would mean my CYA value is between 160 and 180 which would be really high.
I did have algae in the pool a month ago and tried shocking and tabbing until I found this website. I then ordered my kit and started my SLAM at the highest readings on the CYA chart. It worked. My pool turned cloudy, then over a period of 2 weeks my sand filter finally cleared the water. I then took remaining bucket of Tabs and box of Shock bags back to Sam's for a nice refund. I've been maintaining my FC between 12-13 since then assuming that my CYA is very high. I've drained some water and refilled as it's stated here to do. I did let my FC fall to 8 just so I could get a good reading of PH and TA which were 7.2 and 120. I remember reading that FC had to be below 10 to get an accurate PH reading. I added the appropriate amount of Borax according to Pool Math page to raise PH to 7.5 and then brought FC back up to 12.
I plan to dump more water to try and get CYA back down below 100. My only concern is if I'm doing the CYA test correctly. My wife is concerned that the FC is to high to swim in but I informed her that it is being buffered by the monstrous amt of stabilizer currently in the pool. I'm so glad I found this website.
For now though, we are enjoying the pool. I know that TA is high at 120 but should I worry about that now or after I do a few partial drains/refills to fix CYA first?
Thanks again for a great site! You guys (and gals) are lifesavers!