This morning I read an article about saving money. It mostly focused on which items you should and should not buy in bulk and gave the reasons why. A so-called "expert" stated that you should not buy more bleach than you can use in 6 months because it begins to rapidly lose it's effectiveness after that point. Has anyone ever heard that before? I always assumed it had an indefinite shelf life, buy maybe I was wrong. Maybe this explains the confusion I had when I opened my pool this year. I was using the last of the bleach I had left from a pallet I bought over a year ago. I added exactly the amount the pool calculator called for each time, but but when I did the FC test my numbers would be low and I had to keep adding more bleach. At the time I blamed it on my test kit and went out and bought a new one. The new kit gave me the same results.
I never imagined it could be the bleach.
I have now used the old bleach up and bought more. Now then the pool calculator amounts are right on the money.