Dirty filters are the #1 cause of suction loss. We explain the difference between foam, felt, and HEPA filters, and the correct washing method to prevent mold.
If your Shark Navigator has lost its powerful suction, you probably don’t need a repair—you just need a sink. The foam and felt filters inside your vacuum are designed to catch dust, but eventually, they get so clogged that air can’t pass through.
Dirty filters are the #1 cause of suction loss. We explain the difference between foam, felt, and HEPA filters, and the correct washing method to prevent mold.
- Symptoms: weak suction, musty smell, vacuum overheating
- Tools: water, mild soap (optional)
- Difficulty: Easy
Cleaning them is easy, but there is one critical rule you must follow to avoid ruining your motor: The 24-Hour Drying Rule.
Identify Your Filters
Your Shark Navigator typically has two sets of filters. Knowing the difference is key.
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1. Pre-Motor Filters (Wash Monthly)
These are located under the dust cup. Lift the dust cup off, and you’ll see a donut-shaped foam block and a thin felt disc.
- Job: Catch dust before it hits the motor.
- Maintenance: Wash every month.
2. Post-Motor HEPA Filter (Wash Yearly)
This is located behind the front grill near the floor nozzle. It’s a plastic cartridge with pleated paper inside.
- Job: Trap allergens so they don’t blow back into the room.
- Maintenance: Wash once a year (or every 2 years for light use).
Step-by-Step Washing Guide
Step 1: Rinse with Cold Water
Take the foam and felt filters to a sink. Run them under cold tap water. Squeeze the foam gently like a sponge to work the dust out. Keep rinsing until the water runs clear.
- Tip: You don’t usually need soap. If they are very dirty, a drop of mild dish soap is fine, but rinse it out thoroughly.
Step 2: The HEPA Filter
For the plastic HEPA cartridge, tap it against the side of a trash can first to knock loose dust. Then, rinse it with water (dirty side down). Do not scrub the paper pleats; they are fragile.
Step 3: The Critical Drying Phase
Squeeze the excess water out of the foam (don’t wring the felt or HEPA). Lay them flat on a towel in a ventilated area.
Figure 1: You must wait ONE FULL DAY. No exceptions.
NEVER put a wet filter back in your vacuum. Moisture will be pulled into the high-speed motor, which can rust the bearings or cause a short circuit.
FAQ: Filter Maintenance
Can I put them in the washing machine?
No. The agitation is too rough for the felt and foam. Hand wash only.
Can I use a hair dryer to speed it up?
We don’t recommend it. High heat can shrink or warp the foam. Air drying is safest.
When should I buy new ones?
Even with washing, filters degrade.
- Foam/Felt: Replace every 2-3 years.
- HEPA: Replace every 3-5 years.