Defender 32oz. View cart “Bio Ouster Portable Hot Tub Watercare Kit” has been added to your cart. $24.99 Add to cart Add to Wishlist Category: Spa Chemicals Description Description A concentrated formula developed to help prevent scale formation, use weekly for continued protection. Related products Spa Down / pH Down 2.5 lbs $14.99 Add to cart Spa 56 – Chlorinating Granules $32.99 – $75.99 Select options Enzyme $21.99 Add to cart Cover Care & Conditioner 16oz. $19.99 Add to cart