Keep several bird baths clean and free of sludge and stains with help from this CareFree Bird Bath Protector. This liquid cleaner is made from natural enzymes from plants, and safely breaks down organic contaminants, helping keep the basins lovely. Each 4 ounce bottle offers approximately 30 treatments, and is safe to use in stone, copper, plastic, cement, or other bird baths. Beginning with a clean basin, add one capful of this treatment weekly to the water and mix it, to help eradicate stains or other debris. The non toxic, biodegradable, food grade enzymes are safe for use around wildlife and will not harm the environment, and the formula has no restrictions when used as directed. These 12 bottles help treat a wealth of baths, perfect for a wildlife sanctuary or busy bird garden. Prevent sludge from accumulating in your existing bird baths with this Bird Bath Protector. Made in the USA. This case pack contains 12 bottles of CareFree Bird Bath Protector, 4 ounces each. For best results, start with a clean bird bath. Bottle Size: 4 oz. each Treatments: ~30 weekly treatments each