10/27/2021 Turned water off at pre and post isolation valves Placed 5 gallon bucket under pre filter housing Opened drain on bottom of pre filter Used filter wrench to removed housing Removed dirty bag filter cleaned housing Inserted new bag filter Used filter wrench to removed post filter from housing Cleaned and replaced both o-ring Inserted new owner supplied dual gradient filter Tightened both filters as per manufacturers instructions Slowly turned water back on And inspected for leaks No leaks