Guides

Short, sourced answers to the questions behind the numbers.

How to Size a Well Pressure Tank (With the Math)Size a well pressure tank in three steps: pump flow times minimum run time, divided by the share of the tank usable at your switch setting. Pressure Tank Precharge: What to Set It To and WhySet a well pressure tank's precharge 2 psi below the pump's cut-in pressure. What that does to usable water, worked through for a 40/60 switch. Septic Tank Size by Bedrooms: What the States RequireSeptic tank size by bedrooms across the states: 1,000 gallons for three bedrooms is the norm, with the exceptions, the adjustments and the formulas. Total Dynamic Head for a Well Pump, Step by StepTotal dynamic head for a well pump is lift plus rise plus pressure plus friction. A worked 150 ft example and how it picks the pump. What Size Well Pump Do I Need? Flow, Then HorsepowerWhat size well pump you need: the flow comes from your bathrooms, the horsepower from your well depth and pressure. Tables from Goulds and Penn State.