AquaChek 561683 TDS Test Strips, 25/Pack
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$49.22
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Total Dissolved Solids (TDS) is the measure of everything that has dissolved in the water over time. High TDS contributes to cloudy water, which makes it difficult to balance chemicals and can lead to increased chlorine usage. A great use of the TDS test is to determine when it's time to drain and refill a hot tub.