Would a 1/2 HP convertible jet pump with a 7 gallon diaphragm pressure tank system (WaterAce / Shur-Dri type system) be adequate for a recreational cabin ? Water supply is a 1,000 gallon poly tank, 3/4" supply line to pump, then from pump 1/2" copper to fixtures (three sinks, two showers, probably none used at same time). Thanks !