water pressure tank (water in air bladder)

[Kelvin Trumper]

I have an old pressure tank which has an air bladder to control the pressure of the water it is holding. I recently went to test the air pressure in the tank (after a long time of not testing) and found that there was a substantial amount of water in the bladder. Is the tank fixable? Can I drain this water and fill up with air again? How big is the bladder (it is an old John Woods tank) and how much water should I expect to be in the bladder? Should I drain the water tank before I attempt this? Thank you in advance

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