Pool Sand Calculator

This calculator helps determine the amount of filter sand needed for your pool sand filter based on filter size and sand type.

Sand Types & Characteristics:

• • Silica Sand (#20): Standard option, 100 lbs/ft3, most economical
• • Glass Sand Media: Eco-friendly, 85 lbs/ft3, better filtration
• • Zeolite Sand: Premium option, 55 lbs/ft3, excellent filtration

Filter Size Guidelines:

• • 16-19" filters: Small pools, 150-250 lbs sand
• • 20-22" filters: Medium pools, 250-350 lbs sand
• • 24-26" filters: Large pools, 350-500 lbs sand
• • 30"+ filters: Very large pools, 500+ lbs sand

Sand Bed Depth:

• • Minimum depth: 18 inches for effective filtration
• • Maximum depth: 24 inches to prevent channeling
• • Proper depth ensures even water distribution
• • Too shallow reduces filtration efficiency
• • Too deep creates pressure issues

Sand Replacement Signs:

• • Sand is 3-5 years old
• • Backwashing doesn't clear cloudy water
• • Sand has calcified or clumped together
• • Filter pressure stays high after backwashing
• • Visible debris passes through filter

Installation Tips:

• • Remove old sand completely before adding new
• • Fill tank 1/3 with water to cushion laterals
• • Add sand slowly to prevent lateral damage
• • Use funnel or sand sock for easier pouring
• • Level sand bed after installation

Maintenance Schedule:

• • Backwash when pressure rises 8-10 psi
• • Rinse for 30-60 seconds after backwashing
• • Deep clean with filter cleaner quarterly
• • Replace sand every 3-5 years
• • Inspect laterals during sand changes