The recycling of filter elements and oil separators involves a variety of materials, including plastics, metals, and filter layers. The Hong Kong Government regulates the recycling and treatment of waste oil and filter equipment through the Environmental Protection Department's Chemical Waste Control Scheme and the Water Pollution Control Ordinance to ensure compliance with environmental standards.

• Environmental Protection Department's Chemical Waste Control Programme: Regulates the collection, transportation, and treatment of waste oil and oil separators to ensure compliance with environmental standards.

• Water Pollution Control Regulations: Set limits on grease discharge to ensure that waste oil does not affect water sources.

• Environmental Protection Department's regulatory measures: Recyclers are required to hold appropriate licenses and comply with waste disposal regulations to reduce pollution.