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Water Hardness Cal Plus Calcium Chloride for Water Treatment. High Purity Options: Available in 74%, 77%, 90%, and 94% purity levels for industrial use. Prevents Corrosion: Raises calcium hardness to prevent damage to pool plumbing and heaters. Protects Pool Surfaces: Stops staining and etching caused by low water hardness levels. Flexible Packaging: Available in pillow bags, pails, drums, and various sizes from 0.5kg to 25kg. OEM Service: OEM service is available for customized branding and packaging needs. Reach Certified: Product meets Reach certification standards for safety and compliance.