I have an older deep well, above ground pump. It's a 2" pipe, splits into 2 pipes, so I know I need a conversion pump. It's a small cabin, 1 bathroom, and kitchen sink. I don't know the gpm, or how deep it is. The pump won't pump anymore, it runs, but won't pump water. I assume it's the pump. I don't want to rebuild it, it's a 1975 model, and the tank is getting rusty, etc. I think it's a 1/2 hp pump, and 6 gal tank.
How do I know what size pump and tank to put in? If I don't know the gpm, how do I know what charge should be in the tank, etc.?