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T-Black testing dye provides a two-stage test, both for pool hydraulics and disinfection residual distribution. 1 x 100g bottle for up to 500m3 pool volume. Instructions included. Free chlorine levels in the pool must be reduced to below 0.1ppm before the dye can be dosed. For most pools the dye test can typically be completed and the pool returned to use in 4-6 hours.
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