Choosing the right pool filter is one of the most important decisions you'll make as a pool owner. The filter keeps your water clean, clear, and free of contaminants—but not all filters work the same way. There are three primary types: Cartridge, D.E. (Diatomaceous Earth), and Sand. Each has its own strengths, maintenance needs, and ideal use cases.
In this guide, we’ll break down how each filter type works, the pros and cons, and help you determine which is best for your pool.
Cartridge Filters
How They Work: Water passes through a pleated polyester cartridge that traps dirt and debris. The large surface area allows for efficient filtering without needing backwashing.
Pros:
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Easy to clean (just hose off the cartridge)
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No backwashing required (saves water)
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Compact size is great for small equipment pads
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Filters particles down to 10–20 microns
Cons:
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Cartridges need to be replaced every 1–3 years
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Not ideal for large, heavily-used pools
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Cleaning requires opening the filter housing
Best For:
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Small to medium residential pools
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Pools in drought-prone areas (low water waste)
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Homeowners who prefer quick, simple maintenance
DE (Diatomaceous Earth) Filters
How They Work: DE filters use grids coated with fine, fossilized algae powder (DE) to capture particles as small as 2–5 microns—the highest level of filtration available in residential systems.
Pros:
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Superior water clarity
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Filters the smallest particles
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Great for high-use pools or pools surrounded by trees
Cons:
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Requires backwashing and recharging with DE powder
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More involved maintenance
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DE powder can be messy and must be handled carefully
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Larger and more complex filter design
Best For:
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Pools that demand the clearest water possible
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Pools with heavy debris load
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Experienced pool owners or pros are comfortable with DE handling
Sand Filters
How They Work: Water flows through a bed of specially graded sand that traps particles. Over time, the sand clogs with debris and must be cleaned through backwashing.
Pros:
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Easiest to use and maintain
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Low upfront cost
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Long-lasting media (sand replaced every 5–7 years)
Cons:
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Filters only down to 20–40 microns
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Requires regular backwashing (wastes water)
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Large and heavy equipment footprint
Best For:
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Large pools or commercial applications
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Budget-conscious owners
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Users who want minimal hands-on maintenance
Head-to-Head Comparison
| Feature | Cartridge | DE | Sand |
|---|---|---|---|
| Micron Rating | 10–20 microns | 2–5 microns | 20–40 microns |
| Cleaning Method | Remove & rinse | Backwash & DE | Backwash |
| Water Use | Minimal | Moderate | High |
| Maintenance Level | Low | Moderate-High | Low |
| Filter Size | Compact | Bulky | Bulky |
| Water Clarity | Good | Excellent | Fair |
Final Thoughts
The best pool filter depends on your goals and how much effort you’re willing to invest in upkeep. For low maintenance and efficient performance, cartridge filters are hard to beat. If you want the clearest water possible, go for a DE filter. And if simplicity and durability are your priorities, a sand filter might be the right fit.
Need help choosing the perfect filter for your setup? Let your pool size, usage, and maintenance preferences guide your decision, and know that we’re here to help with the right equipment and replacement parts.