pH Plus Granules (1KG) pH Plus - Increases pH level of your spa and pool water. With the fast-acting pH Plus granules to keep your spa and pool water balanced and hygienic. This product is suitable for Mspa hot tubs, all swimming pools, and home spas. ISO9001 certified for quality assurance. Easy to use with clear instructions provided. Large bottles for long-lasting use, ensuring clean and safe water.