Guide topic
Off-Grid Water
Plain-English, standards-cited guides to sizing an off-grid water system.
Guide
Sizing a well pump: total dynamic head
The four components of TDH — drawdown, lift, pressure, friction — and how TDH and flow pick a pump.
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Guide
UV disinfection dose (NSF/ANSI 55)
The Class A 40 mJ/cm² standard, why flow rate and water clarity set the real dose, and UV's limits.
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The app for this
Well: Off-Grid Water Calculator
Well drawdown, pump TDH, pressure-tank cycling, UV dose, filtration, cistern, and rainwater — sized with citations from Penn State, USDA NRCS, ARCSA, EPA, and NSF/ANSI 55. Free to download.