Thinking about replacing 1/2 Hp Craftsman Hydo pump and 36 Gal SearsPressure tank. This set up worked well for 30 years but pump now whining loudly and tank needs aired 4 or 5 times a year. I'm thinking about replacing with a Myers HR50S pump but undecided about a tank. 2 story home with 1 1/2 baths. Pump and tank are in basement. I pump from a 500 gal storage tank which is also located in basement. Myers pump has a cut out at 20 psi. Would I set the tank pressure at 18 psi? Would this be too low for pressure? Which tank would match well with the Myers pump. Or,should I try something completely different? Your help would be appreciated.