Essential Calcium Hardness Increaser: Ahh-Some Hardness Control boosts calcium levels in your hot tub or spa, ensuring optimal water hardness and balance. Prevents Equipment Damage: Helps prevent corrosion of spa equipment and surfaces, as well as etching and staining caused by low calcium hardness. Easy Application: Simply add the recommended amount to your water, run the filter, and allow the product to dissolve for quick and effective results. Precise Dosage: Our 1 lb bottle provides accurate dosing instructions, with 1 ounce increasing hardness by approximately 10 ppm per 500 gallons. Made in the USA: Produced with high-quality standards in the USA, ensuring reliable performance and safety for your spa and hot tub maintenance. Maintain perfect water balance with Ahh-Some Water Care Hardness Control. Our 1 lb Calcium Hardness Increaser is essential for keeping your hot tub or spa's calcium levels in check. Proper hardness prevents corrosion of equipment, etching of surfaces, and staining of spa interiors, ensuring longevity and pristine condition of your spa. Easy to use, simply add the product as directed, run your filter, and see immediate results in balancing your water. Each ounce increases water hardness by about 10 ppm per 500 gallons, making it straightforward to achieve the ideal calcium level. Proudly made in the USA, our Hardness Control provides dependable quality for your spa maintenance needs. Enjoy balanced, clean, and comfortable water with minimal effort.