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Commercial Pool Water Chemistry Guidelines Sign - 12 x 18 Inches on Styrene Plastic for-use-with_Pool/Spa The Duraflex hinge pin isThis Commercial Pool Water Chemistry Guidelines sign measures 12 x 18 inches, is printed on . 040 Styrene Plastic and is designed to post water chemistry guidelines for commercial pools. Our general information signs post helpful information. This sign is lightweight, durable, and waterproof for indoor or outdoor use. This swimming pool and facility pool sign is designed for harsh swimming pool and outdoor environments. It includes a brass grommet in