Abstract: A coolant regeneration system having a housing with an inlet port and an outlet port adapted to be in flow communication with a coolant stream and a filter positioned in the coolant stream. A regeneration canister containing a corrosion inhibitor is positioned in the coolant stream and a monitoring device to monitor the operation of the system. The monitor device includes a temperature sensing element. The monitor device includes a regeneration canister deterioration sensor. Methods of the invention are also included. The invention further includes an integrity probe positioned against a wall of the regeneration canister and a non-corrosive coating positioned on the wall of the canister and between the canister and the integrity probe.

Abstract: A solid, water-soluble coolant system treatment tablet for addition to the overflow cannister of an engine coolant system. The tablets are pressed solid cakes including a scale and deposition preventative, a pH buffer, a chemical inhibitor, at least one corrosion preventative, and a binder. The inventive tablets include sodium tetraborate, sodium meta silicate, sodium nitrate, sodium MBT, and for diesel engine use, sodium nitrite.

Abstract: A coolant regeneration system having a housing with an inlet port and an outlet port adapted to be in flow communication with a coolant stream and a filter positioned in the coolant stream. A regeneration canister containing a corrosion inhibitor is positioned in the coolant stream and a monitoring device to monitor the operation of the system. The monitor device includes a temperature sensing element. The monitor device includes a regeneration canister deterioration sensor. Methods of the invention are also included. The invention further includes an integrity probe positioned against a wall of the regeneration canister and a non-corrosive coating positioned on the wall of the canister and between the canister and the integrity probe.

Abstract: An apparatus and a process for recycling used engine coolant employs a reverse osmosis process for separating ethylene glycol from a concentrate coolant solution. The engine coolant concentrate is pre-filtered through a series of filters and pressurized prior to being passed through a semi-permeable membrane. The membrane separates the feed stream into a permeate solution of ethylene glycol and water and concentrate solution. The concentrate solution is returned to a concentrate tank for continuous circulation through the apparatus. A heat exchanger maintains the temperature of the concentrate solution below a pre-established threshold.