I was told that I should replace my Galv. tank due to excessive air in lines inside home. I have replaced Galv. with a bladder tank and now the air problem is worse. I called a well service and was told I should pull the pipe to the well and "cap-off" a valve about 20' down the pipe. Is this something I should attempt to do myself...? I did replace the tank myself with no problem. I have never had a well before this.