Washable Filters

There are a host of washable filters on the market from simple sponge type to electrosatic filters.
The old "horse hair" type is a cut to fit media about an inch thick that is usually green or blue in color. It is a dense poly material that will hold a lot of dirt.
The draw back of these are they must be washed every 45 days minimum or you will have dirt in the interior of the filter.
They are fairly inexpensive but are not efficient in stopping allergens, spores etc.
You can use a spray on soap solution and water to clean them--outside with a hose is recommended.
Next time we'll discuss electrostatic filters.