I'm a recent convert to this method from chlorine tablet ****. I've had a pool for 4 years and have had more and more trouble keeping the algae away using chlorine tabs and granular shock. This winter I discovered Trouble Free Pool and decided to give it a shot. I ordered a Taylor K-2006 test kit, just in time too - temps around here just shot into the 80s and the pool started turning green. I suspected my problem has been an elevating CYA considering I've always used tabs; I was right, CYA over 100. This weekend I rented a submersible pump and dumped out about 2/3 of the pool, refilled and retested. While refilling I added 2 gallons of 10% bleach to deal with the algae starting to take hold. Here are my measurements:
CC Not tested
I succeeded in getting the CYA down, but it's curious that even after 2 gallons of 10% bleach FC would not register, I sanity checked with a test strip - sure enough, no chlorine. Using the pool math on a 12,000 gallon pool the calculator called for 2 more gallons of 10% bleach to get to my shock target of 16. It seems my TA level is also high, any tips there? I'm running the filter now with the added bleach and will retest tomorrow and update this post. If I'm headed down the right path let me know - or feel free to give me any tips you might have! Especially from my fellow Phoenicians. Thanks!