Primary filter 1/2
1. Small holes or perforations have developed in primary filters.
2. There is a problem with a seal in the primary filter housing assembly. If when inspected, it is found that there is dust building up inside the secondary filter housing, it is recommended to remove the primary filters and check for small holes or perforations.
Primary filter 2/2
Usually, small holes will begin to develop around the stitching of the filter media. If small holes are located, clean area around hole with either compressed air or vacuum. Once area is clean, the hole can be repaired with silicone sealant. If no small holes or perforations are found, check rubber seals in the primary filter housing assembly and make sure they are all intact.
With consistent use the primary filters should be replaced approximately every 6 months. This will maintain good suction levels and reduce incidence of holes developing in the filters.