Because of the acids, moisture, and oil that may be in recovered refrigerants, it is necessary to frequently check and change both the _____ on recycling machines.

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Contaminants in recovered refrigerants can harm the machine, so filtration components must be maintained. The oil filter directly cleans the refrigerant-oil mixture, catching acids, moisture-bound debris, and other oil-borne contaminants before they circulate through the compressor and other components. When the oil filter is not checked and changed regularly, these contaminants can build up, causing corrosion, varnish formation, and lubrication problems that damage seals and the compressor. The dryer removes moisture, which is important, but the question focuses on filtering out oil‑borne contaminants; air filters protect intake air and condensers are heat-exchangers, not filtration steps for the refrigerant stream. Regularly inspecting and replacing the oil filter helps keep refrigerant quality and equipment protection at the right level when acids, moisture, and oil are present.