Universal Acid Scavenging Solution and most concentrated. _x000D_ ACID-BUSTER is the easiest and most accurate method of treating an ACR system for acid build-up._x000D_ _x000D_ ACID-BUSTER cartridges are prefilled with an acid scavenging solution that is compatible with oils and refrigerants in ACR systems (mineral oil, POE, PVE oil and alkylbenzene).