Wednesday, 10 March 2021

CYA testing...and the black dot magic trick

Folks, I've read through some good articles on TFP but I can't find an answer to a question I have on how I should be doing the test...

When I'm testing the pool water (room temperature)....I do the 7ml pool water, and then fill to 14ml mark with R-0013. Then I shake for 30-35 seconds.

I hold the tube waist level, back against the sun. When I start pouring it in the tube....I pour it until the black dot disappears. Great right?

Here's where I'm confused: So the black dot has...

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