Maintaining top sand filter performance keeps pool water beautifully clear and safe. Replace residential pool sand every 3–5 years and commercial pool sand every 1–2 years. Signs for changing include cloudy water, persistent pressure, and fouling. Apply thorough cleaning and chemical purging to extend sand life. Use only approved pool filter sand for optimal results. This guide provides deep technical insight, hands-on advice, clear step-by-step visuals, and cost-effective alternatives for every pool owner and OEM partner seeking high-quality, reliable filtration solutions for the long term.