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I added an "automatic" chlorinator two years ago and shortly after started having problems with yellow algae. I recently bought the TF-100 test kit and with help of this site am finally starting to understand that even though I was shocking the pool with what I thought was a high enough amount...

Hi, Thank you for your chart - it is appreciated. Just a few quick questions...I am currently shocking my pool to get rid of a yellow algae. When shocking a pool, how long does it take for the chlorine to come down to a useable level? What is the maximum level that you can still allow...

OK - here's the latest. My alkalinity has always tested fine before this. I emailed the TF-100 people because it seems like the kit might be a little defective. The drop from the R-0009 is quite small - (about half the size of a "normal drop"). I just took my water into my local pool store...

Thank you Joyce. You are right, I forgot the zero. The alkalinity is actually 350 - very high. I just checked it again and it came out at 330. Sorry for the mis-placed decimal pt. and the slow reply...too many projects going on at once I am afraid...I look forward to your reply. Just as an...

Hi, I own an IG "low-hung" 18 x 36 pool (est. 28000 gal) with a sand filter system. I just received my TF-100 today and my readings are... FC-12 CC-0 pH-7.3 T/A-35 CH-220 CYA-50 Temp - 86 My water is crystal clear. I use liquid chlorine and I also have an auto chlorinator but I have turned...