I did buy a test kit. It has shipped and should be here by the end of the week. I have a question about testing and adding more bleach. If I am supposed to test it a couple times a day (prob will do it at 6:30 am & pm) do I add the bleach needed at 6:30 am to get it back up to 15 ppm even in the morning? I read where you are supposed to add it at night so it will do a better job. Thanks for all the help.