Listen to 8:18 ...

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Listen to 8:18

http://scalinguph2o.com/2018/10/26/057-pinks-and-blues/

"Free is what is available right now to do a quick kill and start to sterilize or sanitize the system. Total is the addition of free and combined Chlorine - combine with some organics (bromine for example" It is important to know what the total number is for both. If way more combined Chlorine than free this may or may not be a problem depending on the application.