What this tool does
Keeps rated output, user-supplied manufacturer correction factors, operating time, demand and usable storage as separate quantities.
When to use it
Use after finding correction factors for the exact membrane and feed conditions; do not substitute generic temperature or pressure correction formulas.
Inputs and supported units
Each labelled field explains the quantity it expects. Unit-system changes convert existing numeric entries once and keep calculations on a single SI internal basis. Supported shared units include L/min and GPM, metres and feet, kPa and psi, millimetres and inches, kW and hp, and °C and °F as relevant.
Calculation or decision method
The planner compares reserve-adjusted daily demand and the larger of daily deficit or peak-period storage need with initially available usable storage.
How to interpret the result
Read the primary result with the supporting breakdown and warning. A plausible number is not evidence that every input, operating case or design constraint has been included.
Worked example
A 2,000 L rating over 24 hours, operated 20 hours with factors 0.9, 0.95 and 0.98, yields about 1,396.5 L/day. Against 1,200 L/day plus 10% reserve, the daily margin is about 76.5 L.
Assumptions
The entered water test, flow, product concentration and manufacturer values represent the same source, use and operating condition.
Limitations
The result is a transparent preliminary calculation or decision screen. It does not establish contaminant removal, potable safety, product certification, regulatory compliance or an approved treatment design.
Sources
- U.S. EPA — Reverse Osmosis Process
- U.S. CDC — About Home Water Treatment Systems
- U.S. EPA — Drinking Water Technologies