Hi

I just bought an air compressor, 20 gal tank. I will probably use this
about once or twice a month and for max 10 to 15 mins most times - just
for quick jobs in the garage.

Q1. Do I have to drain the air from the tank after each use?

Q2. If the air doesn't have to be drained, should I bleed the water
from the drain cock after each use? every week? every month? Do I
have to lower the pressure (150lb max) in the tank before bleeding off
the water? If so, to what level?

Thanks

Keith