Turn Off Gas/Pilot Light
You do not want any dust flowing up into your heater while you are cleaning, so shut off the gas flow first.
Remove Filter
The filter is kept in place with a simple catching mechanism. Find the catch mechanism, undo, and remove from your heater’s bottom.
Clean
To clean your filter, you can use compressed air to blow away the excess dust. If you don’t have an air compressor or “air in a can,” then lay out your filter on the ground, and then spray with water until the dust is removed.
Dry
If you use water to clean your filter, then hang your filter to dry, or wipe down with a cloth.
Put Filter Back in Place
Once your filter is dry, replace underneath your water filter by stretching around the bottom, and then using the grasp mechanism to secure. Check on all sides to ensure that your filter is seated properly and has no gaps that would allow dust through.