I have a new inground pool that was finished and filled May 30, 2013. Prior to it being built and during construction did plenty of reading here. I have had a Taylor K-2005 and added the FAS-DPD Chlorine test to it. Have been testing Chlorine and PH daily; TA, CH weekly and have tested CYA twice. The only thing that has gone in the pool has been stabilizer, liquid chlorine and muratic acid. Pool has been testing fine with PH drifting up and I have to lower it with Muratic Acid about every 3 days. I'm in Phoenix and its Hot and humid at the moment (Monsoon time of the year) Have been getting a little rain, some wind and dust blowing so have more then normal leaves in the pools that I have been skimming out each day. So for two months my CC level has been at 0 using the FAS-DPD test and now all of a sudden today it registered at .5 so I did the more precise test by filling to 25ml and its currently showing at .4 Do I need to be concerned? Water is currently crystal clear. Here are the current test results
FC 1.0
CC .4
PH 7.6
TA 100
CH 190
CYA 30
FC 1.0
CC .4
PH 7.6
TA 100
CH 190
CYA 30