Pool volume in US gallons and pump/hose flow in gallons per minute (GPM)—time to fill in hours and minutes.
Given US gallons to fill and a positive gallons per minute (GPM) flow, the page uses minutes = gallons ÷ GPM, then shows whole hours plus rounded minutes, with a secondary line for total minutes (one decimal). Pipe losses and pump curves are not modeled.
Pipe losses and pump curves are not modeled.