4 Surprising Facts About Pool Filter Sand

Efficiency declines over time: New sand (.45–.55mm, rough) traps debris well. It smooths with use—replace every 5 years.
Great for aquariums: White, smooth, clean—attractive and fish-safe. Inexpensive at pool stores.
Seasonal runtime varies: Winter: 4–5 hrs/day; Summer: 8–9 hrs; Spring/Fall: ~7 hrs.
Works like a coffee percolator: Water forced through sand = clean water out, just as coffee percolates through grounds.

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