AquaChek 7-in-1
Free Chlorine reading of 10 ppm
Critical high
What it means
Free chlorine at 10 ppm is unsafe to swim in. Almost always recent over-shock. Eye and skin irritation is common at this level.
What to do
Do not swim. Wait 24 to 48 hours with pump running and pool uncovered. Re-test. For faster reduction add a thiosulfate-based neutralizer per label.
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