AquaChek 7-in-1
Free Bromine reading of 10 ppm
Critical high
What it means
Free bromine at 10 ppm is unsafe to swim in. Almost always over-shock or feeder runaway. Skin and eye irritation is common at this level.
What to do
Do not swim. Close the feeder completely. Wait 24 to 48 hours with pump running. Re-test. For faster reduction, a sodium thiosulfate neutralizer can be used per label, but waiting is the safer default.
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