A/C Easy dry Contains A Dehydrating Agent That Converts System Moisture Into A Natural Organic Material That Is Compatible With And Mixes With The Lubricant. We Recommend The Use Of A/C Easy dry Whenever There Is A Concern That A System Has Moisture. It Can Also Be Used Prior To A/C Easy seal To Ensure All Moisture Has Been Removed From The Air Conditioning System. The 3 Oz. Aerosol Can Is Sufficient To Treat Systems Up To 5 Tons. Made in United States. Manufactured by Nu Calgon.