Gallon, Deck/Fence Cleaner, Concentrated Multi-Task Formula, Makes Up To 11 Gallons, 2 Surfactants, Effectively Removes Stains & Discoloration Restores Original Look To Wooded Decks, Fences & Shake Roof Shingles. Contains Sporex Which Removes Mold, Mildew, Algae Spores & Stains From Wood, Decks, Fences, Even Composite Decks, No Scrubbing Needed, Just Spray & Wash Off, Special Additives Act To Protect "O" Rings, Does Not Contain Bleach Or Ammonia, Earth Friendly Formula, Safe For People, Pets, & Plants, Water Based, Non-Toxic, Biodegradable.