How Do You Choose a Pool Filtration System?
Filtration system selection depends on pool volume, target turnover (circulation) time, bather load, and budget. Sand filters are economical and common, cartridge filters use less water for cleaning, and diatomaceous earth (DE) filters provide the highest water clarity but require more maintenance.
Comparing Filter Types
Sand filters are easy to clean via backwashing and offer low operating cost, making them the most common choice for villa pools. Cartridge filters don't require backwashing, saving water, but need periodic cartridge cleaning or replacement. DE filters provide micron-level filtration and are typically chosen for commercial/spa projects.
How Is Turnover Time Determined?
Turnover time is how long it takes for the entire pool volume to pass through the filter once. Private pools typically target 6–8 hours, while high-traffic commercial pools target 2–4 hours. Pump flow rate and pipe diameter are engineered around this target.