Starting up right!

Use the FAS-DPD tester. The color block is useless above about 3. I find anything from 4-7 looks like 5 to me, and it really doesn't noticeably look more school bus yellow than canary yellow until it's past 10.

You could be losing 2 ppm and adding 1 ppm vua SWG and it will all look the same.
 
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