First, I want to say that I am a new member, but have been lurking here for several years. You all have taught me the BBB method and I love it! Thank you. I just opened up my pool and was pleased to find it quite clean. I bought some bleach from Walmart to shock the pool, the brand is "Good Value", I checked and it is 6%. I put enough bleach to bring the FC up to 18 based on the Pool Calculator but when I tested the water 2 hours later the FC was only 7 and the CC was 0 (clear) based on my handy Taylor Test Kit T-100. I got the same result an hour later. Its a rainy, cloudy day so the sun should not play a factor.. Is there any way to check whether Bleach is still "fresh"? Also, how long does the chemicals in the Test Kit last, mine is about 3 years old. I would hate to have to replace all the chemicals if it is not necessary. Any thoughts?