Be very carefully about any "help", this is a price fixed scam like mobility devices. They also make false claims on what is filtered. Search "hepa filters", limit the search results to sites having".edu" in the ADDRESS. These results still need study and comparing to get at truth.
Pharma grade HEPA filtering process has several stages of filters, then ozone is added to kill MOST pathogens such as mold and bacteria. This ozone will kill you too, it is not safe to breathe by any living critter. Its the amount of ozone that you breathe, can your body replace the cells in your lungs that ozone destroys? One ozone3 molecule destrys one mold cell, internet even has images showing this. Hepa ozone generator devices are not safe for home use, they were banned in Ontario in the 70's. STILL getting sold.
Home types of "air cleaners" has poor filtering, designed to clog, goal is to sell replacement filters at inflated prices. These can be modified for better pre-filtering using the filtering paper from new vacumn cleaner bags (cheapest is found in charity stores hanging near the appliance section). Tape a layer over the outside, tape another layer over the first filter. Change as needed, use tape that won't fall off. This keeps the second stage carbon filter from clogging, it will not extend its life, just the clogging.
The "activated carbon" chemically attracts tiny mold particles that pass thru the pre-filter layer(s). These adhere, they will saturate the surface in time, you may not see this against a light source, replace in 2-3 months. The carbon filter is usually thin, can be adhered to a paper filter or in a thin fabric, you can see the black. Hold it to the light, now see gaps between the black, indicates quality, gaps still works to a reasonable level.
Does the filter have REAL activated carbon or just IMITATION carbon coloring ? Don't expect gov to verify sold goods, they only acted on complaints after the scam, complicated by gov muzzling these days.
You don't need expensive to clean 90% of lung clogging fine particles from the air in your home. You need to move if its a mold issue, good luck getting a building inspector to help the poor get the paper, to get ODSP help papers or funds. Home built works better than most commercial units. The best has 2 layers of filter paper, then a carbon filter that is replaced every 2-3 months OF USE. The best has ONE INCH of activated carbon, commercial filters are round and cost about $100 from the USA. The machine cost $400., overpriced but it works the best.
To detect "ozone generators" installed in air cleaners : First off low level ozone smells, sort of like bleach. The air smells clean and pleasing. I tested a $3200. unit this winter, overnight in my apartment, a dangerous scam called Saviair 5000. This company is defunct, I assume gov jumped all over them, maybe just failed by price. It has a very well constructed steel cabinet and a $60. of parts inside. I got mine at a garage sale for $50., clogged with drywall powder. I will use it to clean my photos that got mold contaminated, but OUTSIDE of my home. Th cabinet can be converted to pure filtering, remove both ozone generators.
On the inside there can be 2 types of ozone generators. First is an electrostatic cage, makes snapping noises. This is a high voltage current arcing between surfaces, don't test with your finger! Its you that experiences the electrical shock, not your finger! The other common type is sneaky, has one wire leading to the PLASTIC grill, easy to miss, you need to remove covers to examine.
The first type causes "oxygen3" molecules to be created by arcing electrical current to aluminum (and a few other metals). The other type does this without arcing, but within the plastic. Both results in O3 molecules.
What no tells you is about the OTHER MOLECULES getting released into the air you will breathe!!! I don't remember the specific names (do the science search). Don't trust any air cleaner having ozone, don't trust marketing, don't trust high priced goods.
Home vacumn cleaners do not filter mold, it passes right thru, so do the pathogens. ALL home vacs including HEPA filter claims, read the science. Best is central vacs that vent to the outside, not inside your home. Next best is your vac outside and you use a long enough hose. Canister types work very good, did you know an old Filter Queen has the same vacumn parts as a $2000 commercial use? Get canister types for $2-5 at garage sales, I got my steel wand this way. These old vacs need disassembling and careful cleaning AND very careful drying of metal parts. You wash the motor parts too. Just like new, I have done a dozen over the years. You need to examine the electric contact brushes better deciding to recondition. Are they good for years, can I get replacements?
Last point is how can you tell black mold from carbon ( road dirt tracked into your home, its all over you). The carbon comes from car tire wear, exhausts, in the air from coal power plants, many more including earth. Take a pinch of dirt, place on a saucer, add one drop a bleach to a portion. Observe this in 10 minutes, did the color change? If true it is PROBABLY mold, no chance then it is carbon or other inert substance. Surfaces can be wiped with a damp paper towel, then test a portion of the colored area.
Do this when inspecting a new residence, a damp paper towel wipe, then place in ziplock bag, test at home. Tell the landlord before going in so he understands the purpose. If the landlord is resistant, run like the wind!
Print this and get help if my descriptions are hard to understand. People that sell air cleaners USUALLY know nothing about them.