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Nature 2 ® SPA Test Strips Keep spa water at optimum levels easily with these handy Test Strips. Test the monopersulfate, alkalinity and pH levels just by swirling the Nature 2 Spa Test Strips. Features: • 50 strips per package • Color-coded quick guide on package • Instant readings for MPS, alkalinity, and pH Part No. Description W29300 Nature 2 Spa Test Strips (single unit). Order in multiples of 24. Previous part # W22300 (24-pack) 2016 Zodiac Pool Systems, Inc. Product Catalog 217