Nava 1-Inch Swimming Pool and Spa Bromine Solid Tablets (4 Lbs) Note: Signature is required upon delivery! Bromine tablets are a chemical sanitation treatment useful on both spas and pools. Our bromine tablets, 1-inch in diameter, work best at 2.0 to 4.0 ppm. Bromine's germ and algae killing functions are much less dependent on pH than chlorine and there is no stabilizer build up. Less harsh on skin, eyes, hair, and swimwear. 100% Soluble - No chlorine odor. Feed through spa float or automatic brominator