my PB charges about $330 to open (take cover off, power wash, vacuum, reinstall SWG, take out plugs etc etc. and dumps about 4 gallons of Chlorine) the rest of the chemical balancing is up to me, which is good since you usually have left over stuff from last year... 20lbs of CYA, wow! I only had to put in about 1.5 lbs to get it up to speed this year. I guess you will have chemicals for the next 2 years, so at least you won't have to pay for it next time.