Do some or all chemicals get old and not work properly?
I have the TF-100 kit but when I do the FC test it does not seem to change the color of the water anymore (R-870, R-871). All I get is a bunch of black chunks floating around and the inside of my test bottle is all stained.
Being not sure I have went back to using the local pool stores and what a nightmare that has been. Two different places, two different results. I did an simple chlorine drop test (using Taylor K1000 kit) this morning and get around 5, go to the pool store and he tells me the chlorine is zero, BUT, my phosphates are too high and all my chlorine is getting used up so I need phosphate remover.... lol.