18.09 What maintenance and inspection is required for filtration systems?

Maintenance and inspection requirements include the following:

• (a) daily visual inspection of the filter unit and piping for leaks.
• (b) weekly inspection of the filter unit for water accumulation and high differential pressure.
• (c) drain water from filter vessel when a high water condition is indicated.
• (d) change filter elements when a high differential pressure (approximately 15 PSI) is indicated.