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Just immerse strip, swirl 3 times, remove with pads face up, and compare against the chart on the bottle (see image). It's that easy!
50 strips that test total bromine, free chlorine, pH, and total alkalinity
This is a single, simple 30 second test to detect ozone in your ozonator tubi...
50 spa test strips; tests monopersulfate, alkalinity and pH