A Bionaire humidifier with a permanent filter will never need to be replaced. Yet it is necessary to make sure that the filter is cleaned properly on a regular basis.
Water in the humidifier should be changed daily. Empty the humidifier chamber in the morning after you wake up, and fill it with fresh distilled water in the evening before you go to bed.
When it is dirty.
When it is dirty.
The Aprilaire filter should be changed every 6 to 12 months for optimal performance.
Pre-filter for what? You posted this question in the Fuel Filter category. So I must assume you mean the pre-filter on the fuel pump. That is changed when the fuel pump is replaced.
Change the oil filter every time you change the oil.
You can. However, the impurities in tap water (or well water) will gum up the filter more quickly. Thus, it would be important to check the filter more often - monthly, at least.
The fuel filter.
whenever you change the oil
I recommend you change it every 75,000 miles.
Depends on which filter you are asking about. Oil Filter = Every 5,000 miles. Air/Cabin Filter = Every 30,000 miles. Fuel Filter = Every 50,000 miles.
An air purifier's filter should be changed every year, with the pre-filter cleaned or replaced every few months, depending on the conditions that the device operates in. Always follow the manufacturer's instructions.