BioGuard – Spa Calcium Hardness September 29, 2011 By Bonnie $4.95 Protects spa surface and equipment. Qty Add to cart SKU: 5015 Category: Water Care Supplies Description Additional information Description Prevents corrosion of equipment due to low calcium hardness . Additional information Weight 0.875 lbs Related products Watkins Freshwater AG+ Purifier Cartridge $32.95 Add to cart Leisure Time Spa Down ~ Balancer $5.95 Add to cart SpaGuard Chlorinating Concentrate ~ 14 oz. $9.95 Add to cart InstaTEST 4 Plus $9.95 Add to cart Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website Save my name, email, and website in this browser for the next time I comment.