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In-home air purifiers really do work. However, their value depends on what you're trying to achieve. Mechanical air filters other than those with true HEPA filtration aren't capable of removing bacteria and viruses from the air. However, many of them can reduce very fine particles, including pollen, a known allergen. On the other hand, UV light filters can remove harmful pathogens but can't remove particles.  

It’s not customary to tip HVAC technicians, and most professionals won’t expect it. However, it’s a nice way of showing your appreciation for the work they do, especially if they come out in inclement weather or on a weekend or holiday to fix an emergency issue if your heat or AC goes out in extreme temperatures. A good tip would be between 10% to 20% of the total bill, depending on how above and beyond the tech goes for your repair and on the total cost of your HVAC repair or service. For something like a routine tune-up or scheduled maintenance, tips aren’t expected.

Always turn off the power to your HVAC system before you remove the front cover to replace the air filter. If there isn’t an off switch, turn it off at the circuit breaker box. This prevents the risk of electric shock and stops unfiltered air from passing through the ductwork while the thermostat is running.

If you have black flakes or chunks coming out of your tub’s jets, it is generally some combination of mildew, mold, soap scum, skin flakes, and oils. These are substances you definitely don’t want to be soaking in as you’re trying to get clean, which is why regularly cleaning your jetted tub is so important.