What’s the Best Type of Pool Filter: Sand vs. Cartridge vs. DE?Updated a month ago
Choosing the right pool filter can feel overwhelming, but each type has its strengths and quirks. Let’s break down the pros and cons of sand, cartridge, and diatomaceous earth (DE) filters to help you pick the perfect match for your pool.
1. Sand Filters
How they work: Water passes through a bed of sand, trapping debris as small as 20–40 microns.
Pros:
Low maintenance: Just backwash every 2–4 weeks.
Durable: Lasts 5–7 years before sand replacement.
Cost-effective: Affordable upfront and easy to repair.
Handles heavy debris: Great for dusty areas or pools near trees.
Cons:
Less precise filtration: Misses finer particles (e.g., pollen, some algae).
Wastes water: Backwashing uses 150–300L each time (a concern in drought-prone regions).
Bulky design: Takes up more space than cartridge filters.
Best for: Large pools, budget-conscious owners, or areas with frequent dust/storms.
Check out pool media filters and sand here
2. Cartridge Filters
How they work: Folded pleats trap debris down to 10–20 microns.
Pros:
Better filtration: Captures finer particles than sand.
Water-efficient: No backwashing—just rinse or soak cartridges monthly.
Compact & quiet: Ideal for small spaces or urban backyards.
Lower long-term costs: Less water and chemical use.
Cons:
Cartridge replacement: New cartridges needed every 2–5 years.
Struggles with heavy loads: Not ideal for pools with constant debris.
Best for: Medium-sized pools, eco-conscious owners, or regions with water restrictions.
Need a pool cartridge filter? Check out our selection of the best pool cartridge filters here
3. Diatomaceous Earth (DE) Filters
How they work: DE powder coats grids, filtering particles as tiny as 2–5 microns (the finest option).
Pros:
Superior clarity: Leaves water sparkling like nowhere else.
Efficient for small debris: Perfect for pollen, fine dust, or algae spores.
Long grid lifespan: Grids last 5–10 years with proper care.
Cons:
High maintenance: Backwash weekly and recharge DE powder each time.
Messy handling: DE powder requires careful disposal (avoid inhaling).
Expensive: Higher upfront and ongoing costs (DE powder purchases).
Best for: Allergy sufferers, coastal areas with fine sand, or owners prioritising water quality.
Comparison Cheat Sheet
| Factor | Sand Filter | Cartridge Filter | DE Filter |
|---|---|---|---|
| Filtration Level | Good (20–40µm) | Better (10–20µm) | Best (2–5µm) |
| Maintenance | Low (backwash) | Moderate (rinse) | High (DE recharge) |
| Water Use | High | Low | Moderate |
| Upfront Cost | $ | $$ | $$$ |
| Lifespan | 5–7 years (sand) | 2–5 years (cartridge) | 5–10 years (grids) |
Which Filter is Right for You?
Sand: “Set and forget” for low-maintenance, budget-friendly care.
Cartridge: “Eco warrior” for water-saving and solid filtration.
DE: “Perfectionist’s pick” for unmatched clarity (if you’re willing to work for it).
Australian climate tips:
Bushfire-prone areas: DE or cartridge filters handle ash better.
Saltwater pools: Pair with corrosion-resistant models (check compatibility).
Hard water regions: Sand filters cope better with calcium buildup.
Need Help Deciding?
Final Tip: There’s no “best” filter—just the best one for your pool, lifestyle, and local conditions. Prioritise what matters most: time, water, or sparkle!
P.S. Don't let filter cartridge prices put you down, there's a whole line of Water TechniX Replacement Pool Filter Cartridges that cost a fraction of branded cartridges that work as good (or sometimes even better) than their branded counterparts.