I have a poolmaster 5 way test kit that I bought before I knew better. It doesn't even have a CYA test. The FC only goes up to 5.
What is the difference in the way FC is tested an measured between this kit and the kits tfp recommends that are FAS-DPD. Will this type of test kit give FC numbers higher than 5?
Is there a link I can learn about how test kits work?
thanks in advance