I used to have a simple test kit for chlorine and pH. The chlorine test was just a matter of adding 5 drops of a liquid to the water and it would turn a yellow color you would match to a color chart to check levels. With the new kit, you add drops to test for free chlorine then more to test for total chlorine. You match it to a color and then subtract FC from TC to get CC. Problem is, the colors have been showing as EXACTLY THE SAME every time I test which would put the CC at 0. I know it is NOT. We have had a lot of rain and yesterday I added chlorine to offset that. I also have at a minimum 3 pucks in the pool. Can anyway explain why this is happening and what it might mean? I don't want to do anything and mess the chemicals up (and we had it tested at a pool store and everything was perfect, which makes me think something is wrong either with what I am doing, or the kit itself...most likely me!). Oh - the test water IS turning a pink color...with both tests...could it be that the water color differential is so small I just can't tell (in other words, one IS pinker than the other but I can't tell with the test colors that I match it with).

Thanks for any advice!