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Hi when testing for CYA if you have fill mixture leftover, can you save and reuse next test or do you need to mix fresh each time? Thanks

Hi im new to your site and have already learned alot from the pool school. I bought a good test kit and have done my first tests. It was easy and fun. One question i have is when the test for TA says it should turn red mine turned dark pink is that the same thing? I didn't want to continue to...