Clean water is essential in maintaining healhy birds. Pigeon Waterer Protector provides clean, clear, healthy water. Prevents film, residue and organic contaminants. Also stops cross contamination of bacteria. This product will safely break down organic contaminants, stains and more. Effective on plastic or galvanized drinkers. Use as often as you change the water. 1 cap full per gallon of drinking water. Will not effect the performance of vitamins, pro biotics or antiobiotics.