PURE OXALIC ACID POWDER: Oxalic acid (ethanedioic acid) is a colorless, crystalline powder that is highly soluble in water. Highly effective and versatile for various indoor and outdoor applications in both home and institutional settings. DECK CLEANER: Restores the natural beauty of decks by removing stubborn stains CONVENIENT & RESEALABLE: Sourced and packaged in the USA, comes in a high-quality, resealable packaging to ensure Safe Transportation, Moisture Protection and Lasting Potency with every use. PuraMinz Oxalic Acid (99.6%) tackles tough stains and rust indoors and outdoors, making it perfect for homes and institutions. This powerful cleaner restores decks, removes rust from concrete, tools, and countertops, and tackles stubborn stains on wood, vinyl, and stone that other cleaners miss. Oxalic acid breaks down stains and rust for easy rinsing and is safe for various surfaces. For best results, dissolve in warm water (always add acid to water!). PuraMinz Oxalic Acid comes in durable and resealable packaging to ensures safe transportation, long laying potency, and extends shelf life. Dilution ratios may vary depending on the application. Always test on an inconspicuous area before full use. Do Not Use On: Marble, limestone, or other acid-sensitive surfaces. Avoid use on coated or sealed surfaces unless tested first. Do not mix with bleach, ammonia, or other household chemicals.