Before you start to clean the filter, determine whether you have an oiled or oil-free filter. Also have the appropriate cleaning kit for your filter: #90-50500 for gold, #90-50501 for blue and #90-59999 for oil-free.
Follow the steps below.
1) Use a soft bristle brush like a paint brush to remove large chunks of debris and dirt from between the pleats. GENTLY TAPPING the filter on the ground to remove any loose dirt being careful not to bend any of the pleats.
2) Spray the cleaning solution that comes in our Restore Kit, on the dirty side of the filter. Let the cleaning solution soak in for about 10 minutes.
3) Rinse the filter from the clean side of the filter to the dirty side. Repeat spraying and rinsing until the water is clear. Since media will be stained, it will not be completely white and may still appear dirty.
4) DO NOT USE A HIGH PRESSURE WATER NOZZLE when rinsing the filter.
5) Let the filter air-dry. DO NOT USE COMPRESSED AIR TO DRY THE FILTER! It may take a couple of hours for a Pro DryS to 12 to 24 hours for a Pro5R depending on humidity and temperature.
6) If you have an oil-free Pro Dry-S filter, the cleaning process is completed and the rest of these instructions can be disregarded.
7) After the filter is dry, apply small amount of oil on the top of each pleat. It is not necessary to apply oil down in between the pleats. It is also a good idea to not apply oil all the way to the urethane. Leave about an inch of media un-colored. DO NOT DROWN THE FILTER WITH OIL! The oil will wick out a great deal.
8) Leave the oiled filter for 8 to 12 hours to allow the oil to fully wick.
9) Spot apply oil to areas that still do not have "color" to it.