The Enviro-Cool Cleaner Filter, No. CLF1020, is a spin-on filter that is installed in place of the inhibitor filter, which allows the cleaner to dissolve and enter the coolant slowly enough to form a homogenous mixture of cleaning agent throughout the entire volume of coolant in the system. Localized damage to the system is prevented, while permitting sufficient cleaning agent to be added. The once-a-year, clean-as-you-drive system does not require draining or flushing, and contaminants are trapped in a 10-micron filter. The filter is compatible with all liquid cooled internal combustion engines, reduces radiator, heater core and oil cooler replacements and increases overall cooling system efficiency by 30 percent, according to the company.