Bleaching Rock and need chlorine test strips - FREE or Total?

Reefrock

Premium Member
Hello

I am in the process of bleaching some old Dry Rock that was given to me. I am going to order some Chlorine test strips to validate the chlorine is gone (adding De-Chlor). I see there are two types...Free Chlorine and Total Chlorine. Which one should I order?

Any help is much appreciated!
 
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