Songbird Essentials Birdbath Protector ensures naturally clear water. Safe for Birds, Pets, and Wildlife. Prevents Stains, Sludge, Mineral Deposits, and Organic Contamination. Non-Toxic all natural Enzymes. Birdbath Protector is not a chemical and needs time to work. Extremely dirty birdbaths may take several weeks to clean. For best results, start with a clean bird bath. Display contains 12 bottles of 4 oz Birdbath Protector