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1. Obtain a new sterile “T-salt” Petri Dish.
2. Place dish in a room to be tested.
Authors note: Position dish in an area that will allow a representative sample to be taken. That usually means to place dish away from ventilation ducts and doorways (but not always). File cabinets and desktops are good places for dish placement. Avoid getting close to ceiling or floor, that’s critical.
3. Petri Dishes may be used directly in duct works if you need this type of testing.
4. Remove Petri Dish cover and pour liquid nutrient into base of dish. Gently swirl dish to ensure bottom is covered.
5. Start your timing (use 30 or 60 minutes; I always use 60 minutes).
6. Once exposure period is up, place cover on dish and incubate dish for a period of 48 hours at room temperature. If you place dish in a warmer environment, say a sunlit window sill, (80 to 100 degrees) count can be made after 24 hours has expired.
7. After incubation period, count all growths on dish. When using T-salt Dishes (used to make counting easier), bacteria will appear as red “dots” or colonies. Fuzzy colonies may be present and that usually indicates mold. White colonies usually indicate yeasts.
Keep in mind that none, one or all these conditions may exist. At this point you have some reliable information. Now, look for source of air quality problems. Example; where there is mold there is water. Find it. And look for BEST solution.
Do you buy an air purifier? Perhaps but, decisions based on any idea that does not include a solid test cannot be relied upon to be a good decision.
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By-Line: T. Downward is an authorized Distributor of Air Purifier Products, a small business owner, manager and widely published author. For Questions or comments he can be reached at firstname.lastname@example.org