The Pool Mate Calcium Increaser for Swimming Pools - 16 lbs. hardens water to prevent corrosion, etching, and metallic stains. Use 6.25 lbs. per 10,000 gallons of water to elevate calcium content by 50 ppm.
About Robelle Industries
Since 1973 Robelle Industries has been providing superior, dependable, and affordable swimming pool products. They have painstakingly built a line of quality swimming pool products that include pool chemicals, pool accessories, and everything in between. Robelle is dedicated to finding new product formulations that meet superior standards of pool chemical efficacy and product durability so your pool is safe, crystal clear, and healthy.