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The ability to produce liter volumes of highly-spin-polarized enables a wide range of investigations, most notably in the fields of materials science and biomedical magnetic resonance imaging. However, for nearly all polarizers built to date, both peak polarization and the rate at which it is produced fall far below those predicted by the standard model of Rb metal vapor, spin-exchange optical pumping (SEOP). In this work we comprehensively characterized a high-volume flow-through polarizer using three different SEOP cells with internal volumes of 100, 200, and and two types of optical sources: a broad-spectrum 111-W laser [full width at half maximum (FWHM) equal to 1.92 nm] and a line-narrowed 71-W laser (FWHM equal to 0.39 nm). By measuring polarization as a function of gas flow rate, we extracted the peak polarization and polarization production rate across a wide range of laser absorption levels …