Ice Maker and Ice Machine Descaling and Cleaning Solution by PurTru is the only all natural ice maker and machine cleaner and descaler on the market. Protect your family against harmful toxic chemicals found in other ice machine cleaning and descaling solutions. Gentle and effective nickel safe green formulation extends life of ice makers and ice machines while improving taste of all types of ice. For best results follow the step by step instructions and descale and clean maker or machine every 1-3 months. Step 1 Prepare Ice Maker or Ice Machine. Empty the water from the ice maker or machine water reservoir. Step 2 Add Descaling & Cleaning Solution. Pour one quarter, or one use using indicator lines, bottle of PurTru solution into the ice maker or ice machine reservoir and fill with water. Step 3 Run Descaling & Cleaning Solution. Run one full reservoir with solution through your machine making and discarding batch of ice. Step 4 Discard Remaining Mixture and Rinse. Discard any remaining mixture of solution and water from reservoir and fully rinse water reservoir. Step 5 Run Fresh Water Through Machine. Fill water reservoir with fresh water and run through machine 3 times making and discarding batches of ice.