Cartridge vs. Sand Pool Filters
Which filtration system is right for your pool? A detailed comparison of maintenance, water clarity, and long-term costs.
Choosing between a sand filter and a cartridge filter is the most common dilemma when designing a pool pad. Both are effective, but they cater to very different maintenance philosophies.
Sand Filters: The Traditional Workhorse
Sand filters push water through a bed of specialized filter sand. The sharp edges of the sand catch dirt and debris as small as 20-40 microns.
- Pros: Lowest initial purchase price, sand media lasts 5-7 years, cleaning is incredibly easy (just turn a valve to backwash).
- Cons: Least effective filtration (water may not look 'polished'), backwashing wastes hundreds of gallons of treated, heated pool water every month.
Cartridge Filters: The Modern Standard
Cartridge filters push water through pleated polyester filter elements. They offer a much larger surface area than sand filters, trapping debris as small as 10-20 microns.
- Pros: Excellent water clarity, zero water wasted (no backwashing required), very low flow resistance (saving pump energy).
- Cons: Cleaning is manual labor (must remove cartridges and hose them down), replacement cartridges are expensive.
The Verdict
If you live in an area with water restrictions, or if you are pairing the filter with a variable speed pump, a Cartridge filter is superior. It saves water and lowers pump energy usage. However, if you are looking for the lowest upfront cost and want to clean your filter by simply turning a valve rather than using a garden hose for an hour, a Sand filter is the way to go.