You can clean an electrostatic air filter in two different ways.
CLEAN ELECTROSTATIC AIR CLEANER BY USING VACUUM CLEANER
This method is the simplest, fastest and cheapest method of cleaning an electrostatic air filter. You just use a vacuum cleaner and suck all the dirt from the air cleaner. You don’t even need to separate anything. If there is lots of dirt, then it is best you remove the filter from the air cleaner and suck it thoroughly. If you use vacuum cleaner once per month then most probably you will not require any other methods of cleaning.
CLEAN ELECTROSTATIC AIR CLEANER BY USING WATER HOSE
This method is required if the dirt is so deep that vacuum cleaner cant sucks it. Then the device will need to be flushed with a water hose. Make sure you are flushing the water in a different direction than the air filter is sucking air because that way the dirt will not get deeper. If only flushing with water is not helping, then you should get yourself a rag and wipe the filter thoroughly. That will make sure that all areas are clean and that the device is ready for maximum performance.
HEPA VS. ELECTROSTATIC AIR PURIFIERS
Air purifiers that use HEPA filters are without doubt better choice than electrostatic air cleaners. There are many reasons for this statement, but the main reason is that the HEPA filter has more power at removing airborne particles than the electrostatic filter.
Most air purifiers with HEPA filter are capable of removing over 99% of all airborne particles. They can remove all the particles larger than 0.03 microns. This means that people who have asthma, or have any kind of allergies better choose air purifier with HEPA filter, because the electrostatic air cleaners do not have the power to remove allergens like pollen, mold spores, and other minuscule airborne particles.
One of the advantages of the electrostatic air cleaner is that it will last for decades. You will not need to spend a dime once you buy it. It has washable air filters, and you will never need to buy a new filter. This feature will save you money and the problem of replacing them. Some of the air purifiers with replaceable filters have a complex system and replacing an air filter is not an easy job and most of the time will require up to an hour to replace it.
The second advantage is the price. Air cleaners based on electrostatic air filter are extremely affordable. Everyone can afford one.
And I also need to mention few disadvantages. Cleaning an electrostatic air filter may be difficult as well. Sucking the dust with a vacuum cleaner may not be enough, and then you will also need to spend additional time to separate filter and clean it with water.
Ozone as already mentioned is another problem that everyone who is buying an air purifier needs to be aware. If you are buying air cleaner with the electrostatic filter, you need to ask or see on the label how much ozone it emits. Some of the states even abandon devices that emit a significant amount of ozone.
Because of all that I can only recommend air purifiers with HEPA filters. From the start, you will pay the extra money, and you will need to replace HEPA filter every year, but in return, you will get much cleaner air. Also, the concern about the ozone is eliminated, because HEPA filters don’t emit any toxins including ozone.