How to Change the Filter on an Air Purifier: A Step by Step Guide

Home air purifiers are essential devices for those suffering from dust or mite-based allergies, and can generally improve the air quality for all members of the family. They work by drawing the air in a house through a fine particulate filter, thus removing any irritants. Obviously, this leaves the irritants in the filter itself, and the longer the purifier is in use, the more particles will accumulate. Eventually these will build up to a level where the filter is less effective, being unable to draw air through as efficiency, and in long term cases, can even be detrimental to improving air quality, as they simply become dust recyclers. This is why all manufacturers of air purifiers recommend you change the filters within the purifier on a regular basis. What follows is a step by step guide for this simple (but daunting if you've never done it) procedure.

Firstly, keep any documentation which came with your purifier, particularly the user manual. There are dozens if not hundreds of air purifier models and manufacturers out there, and whilst this guide attempts to be encompass them all, having the correct user manual and changing instructions will be invaluable. If you don't still have these, typing the make and model into google can sometimes help find you an online version, usually in a PDF format.

First thing to check in the manual is whether your filter is reusable or disposable; both varieties exist, and have their pros and cons. Reusable are obviously more economical, as they can be washed and reused, but disposable filters are more convenient and guaranteed to be clean.

Locate the filter on your purifier. Generally speaking, this can be found to the rear of the machine, towards the bottom. Consult the manual if unsure.

Remove the filter by pulling or twisting it away from the purifier. Again, check your manual for the exact direction to turn; some models will have a sticker or sign next to the filter describing this.

If reusable, wash the filter in warm water and mild soap. Rinse thoroughly, ensuring no soap is left on the filter. Set aside to dry.

If disposable, you might find it helpful to remove the filter and take it with you when purchasing new ones; replacements are more easily identifiable if you have the original with you. A sandwich bag or similar airtight sealable bag will prevent you getting dusty.

Once the filter is dry (or you have purchased your disposable replacement), replace the filter as per the user manual. Dryness of reusable filters is paramount, as wet filters can cause the purifier to not work, overheat, or even catch fire. Wet filters also cause an increase in risk of spores actually growing mould within the purifier, which obviously is not going to help the quality of your air much.