Expert DiFM Cooling System Treatment for Bar's Leaks 5-gram tablets are ideal for usage whenever the cooling system is serviced, including part replacement and flush and fills. Inhibits rust and scale development, maintains the system clean, neutralizes pH imbalance, regulates electrolysis, and lubricates and plugs internal, exterior, and coolant-to-oil leaks. Compatible with ALL antifreeze kinds and brands, including standard green or blue (Silicate-Based) and extended life red/orange or yellow (OAT/HOAT) coolant. Works in water-only systems as well. It is also advised to apply a cooling system anti-rust and water pump lubrication when utilized in water alone. It safeguards the entire cooling system. It is non-toxic and will not harm the cooling system. Tablets disintegrate completely in minutes. ALL plastics, metals, aluminum, hoses, and rubber are unaffected.