Pool Filter Media Types Compared: DE, Cartridge & Sand | Discount Pool Mart
DE, cartridge, and sand filters all promise clean pool water, but they deliver it in very different ways. Filtration quality, maintenance demands, water waste, and long-term cost vary enough between the three that picking the wrong type can cost you hundreds of dollars a year - or leave you with water that never quite looks right.
At Discount Pool Mart, we service hundreds of DE, cartridge, and sand filters across Los Angeles every year. This pool filter types compared guide draws on real service data and hands-on experience to help you match the right filter media to your pool, your budget, and LA's notoriously hard water.
How We Graded Each Pool Filter Type
I wanted this comparison to go deeper than a recycled spec sheet. We scored each filter type across six criteria that matter most to residential pool owners in Los Angeles:
- Filtration quality - measured by pool filter micron rating
- Maintenance frequency and effort - estimated hours per year
- Water waste - gallons lost per backwash cycle
- Upfront cost - filter system purchase price
- Ongoing cost - media replacement and cleaning supplies
- LA hard-water performance - calcium scaling and service life
Our team compared notes from real service calls, not just manufacturer data sheets. We carry all three filter types from Pentair, Hayward, and Jandy, so there's no bias toward one brand or technology. The goal: match you with the filter that keeps your water sparkling without wasting your time or money.
Diatomaceous Earth Pool Filter: Best for Water Clarity
How DE Filtration Works
A diatomaceous earth pool filter pushes water through a set of internal grids coated with DE powder - a fine white substance made from fossilized diatoms. That powder coat acts like millions of tiny sieves, trapping particles as small as 3 to 5 microns. A human hair measures about 70 microns wide, so a DE filter catches debris invisible to the naked eye.
When the PSI reading on your pressure gauge climbs 8 to 10 PSI above the clean baseline, it's time to backwash the filter and recharge it with fresh DE powder.
DE Filter Pros
- Finest filtration of all three types - approximately 3 to 5 microns
- Produces the clearest, most polished water
- A strong choice for pools that host frequent swimmers or parties
- Grids can last several years with proper care
DE Filter Cons
- Backwash water waste runs roughly 200 to 300 gallons per cycle
- You need to add fresh DE powder after every backwash - a recharge step many owners forget
- Grids can tear and need periodic replacement; see our guide to replacing DE filter grids for the full process
- Highest maintenance knowledge requirement of the three types
- Some municipalities regulate spent DE powder disposal
Who Should Choose a DE Filter?
The DE filter vs cartridge filter debate often comes down to one question: how much do you care about water clarity? If you have a larger residential pool, entertain often, or refuse to compromise on that glass-like finish, a Pentair pool filter or Hayward pool filter running DE will deliver. Just budget for the hands-on maintenance commitment.
Cartridge Pool Filter Pros and Cons: The Water-Saver
How Cartridge Filtration Works
A cartridge filter uses a pleated polyester element housed inside a pressurized tank. Water flows through the pleats, trapping particles in the 10 to 15 micron range. There's no backwash valve and no water sent down the drain. When PSI rises 8 to 10 above baseline, you remove the cartridge, hose it off, and reinstall it. That's the entire cleaning process.
Cartridge Filter Pros
- Zero backwash water waste - a serious advantage in drought-conscious California
- Lower maintenance complexity than DE
- Quieter operation with no multiport valve cycling
- Compact footprint fits tight equipment pads
Cartridge Filter Cons
- Filtration runs coarser than DE (10 to 15 microns versus 3 to 5)
- LA hard water accelerates calcium scaling on the pleats. Our service records show cartridge filters in the Los Angeles area need replacement 30 to 40 percent sooner than manufacturers estimate because of mineral buildup from water supplied by the Los Angeles Department of Water and Power
- Replacement cartridges cost $50 to $150 or more, depending on filter area (square feet) and brand
- Periodic acid soaks dissolve calcium deposits. Our pool filter cleaning guide walks through the full procedure
Who Should Choose a Cartridge Filter?
Cartridge systems work well for water-conscious pool owners with small-to-mid-size pools. They're the simplest filters to operate day to day. If you live in LA, though, expect to spend more on replacement cartridges than a pool owner in a soft-water area. Budget for an acid soak every couple of months during peak season.
For a deeper look at how water chemistry affects your equipment, check out our pool water chemistry guide.
Sand Pool Filter Pros and Cons: The Budget Pick
How Sand Filtration Works
A sand filter directs water down through a bed of #20 silica sand inside a large tank. Particles get trapped between sand grains, and clean water exits through a lateral assembly at the bottom. A multiport valve on top lets you select backwash, rinse, filter, waste, recirculate, and closed positions. When the PSI gauge reads 8 to 10 above baseline, you turn the valve to backwash and flush trapped debris out through the waste line.
Sand Filter Pros
- Lowest upfront cost of all three pool filter media types
- Simplest operation - just backwash when PSI rises
- Sand media lasts 5 to 7 years before needing replacement
- Minimal impact from LA hard water (calcium doesn't scale sand the way it scales cartridge pleats)
- Alternative media like zeolite or recycled filter glass can boost performance
Sand Filter Cons
- Coarsest filtration of the three - approximately 20 to 40 microns
- Backwash cycles waste 250 to 500 gallons of water, the highest backwash water waste of any pool filter
- Water clarity won't match DE or cartridge levels
- Sand tanks run bulky and heavy
Who Should Choose a Sand Filter?
Sand filters are the budget-friendly workhorse. They suit pool owners with large pools who want minimal fuss and don't mind periodic backwashing. If water conservation tops your priority list, sand may not be the best match. But if upfront cost and simplicity matter most, a sand system from Hayward or Pentair is hard to beat. The sand filter vs DE filter tradeoff really comes down to clarity versus cost.
Side-by-Side Pool Filter Comparison Table
This table puts all three pool filter media types head to head. It reflects both manufacturer specs and what we observe during service calls across Los Angeles.
| Criteria | DE Filter | Cartridge Filter | Sand Filter |
|---|---|---|---|
| Filtration (microns) | ~3 to 5 | ~10 to 15 | ~20 to 40 |
| Maintenance Effort | High | Medium | Low |
| Annual Maintenance Hours (est.) | 10 to 15 | 6 to 10 | 3 to 5 |
| Water Waste per Cleaning | ~200 to 300 gal (backwash) | 0 gal (hose clean) | ~250 to 500 gal (backwash) |
| Upfront Cost (system) | $500 to $1,200+ | $300 to $900 | $250 to $700 |
| Ongoing Cost (annual est.) | $30 to $60 (DE powder) + grids every 3 to 5 yrs | $50 to $150+ (cartridges every 1 to 3 yrs) | $30 to $60 (sand every 5 to 7 yrs) |
| LA Hard Water Impact | Minimal | Significant (calcium scaling) | Minimal |
| Best For | Maximum water clarity | Water conservation | Budget and simplicity |
Best Pool Filter for Hard Water in Los Angeles
There's no single "best" pool filter. The right answer depends on what you value most. Here's the quick decision framework I use when talking with customers at our shop:
Prioritize water clarity? Go with a DE filter. Nothing else filters down to 3 to 5 microns. You'll invest more time in maintenance, but the payoff is water that sparkles.
Prioritize water conservation? Choose a cartridge filter. Zero backwash means zero water wasted on cleaning cycles. That matters in Southern California, where every gallon counts. Just budget for more frequent cartridge replacements due to our hard water.
Prioritize low cost and simplicity? Pick a sand filter. The upfront price is the lowest, daily operation is the simplest, and a sand charge lasts years.
Three Questions That Pick Your Filter
- How much does crystal-clear water matter to you? If it's your top priority, DE wins.
- Are you worried about water waste? If yes, cartridge is your only zero-waste option.
- Is upfront budget your biggest constraint? If yes, sand gives you the most value per dollar.
Pool Filter Sizing: Getting the Match Right
Picking the right type is only half the equation. You also need the right size. Match your filter's rated flow (in gallons per minute, or GPM) to your pump's output, and make sure the filter area in square feet can handle your pool's turnover rate. A general rule: your system should turn over the entire pool volume in 8 hours or less. For a 15,000-gallon pool, that means roughly 31 GPM.
If your pump pushes more water than your filter can handle, pressure builds too fast, cleaning cycles shorten, and media life drops. Our team can help you size a filter to your exact setup. You can also learn more about matching pumps and filters in our pool pump comparison guide.
Can You Switch Filter Types?
Yes. Switching from sand to cartridge - or any other combination - is a common upgrade. It usually means replacing the entire filter tank and, in some cases, resizing your plumbing. If you're considering a switch, check out our breakdown of pool equipment installation costs in Los Angeles to budget accurately.
Catching Filter Problems Before They Get Expensive
Not sure if your filter is struggling? A PSI reading that stays high after cleaning, milky water, or unusually short filter cycles all point to trouble. Our list of signs your pool filter needs replacement covers the full checklist so you can catch issues before they turn into costly repairs.
Shop LA Pool Filters at Discount Pool Mart
We stock DE, cartridge, and sand filter systems from Pentair, Hayward, and Jandy at Discount Pool Mart, with pricing that consistently beats big-box competitors. Whether you're buying your first filter or upgrading an aging system, our Los Angeles team can help you pick the right type, size it to your pool, and install it.
Stop by our store, call us, or browse online. We also offer filter repair, media replacement, and full equipment installation across the greater LA area.
Pool Filter Media FAQ
What pool filter media type delivers the finest filtration? Diatomaceous earth (DE) traps particles as small as 3 to 5 microns - roughly seven times finer than what a standard sand filter captures and two to three times finer than a cartridge filter. That makes DE the top choice for pool owners who demand the clearest water possible.
What are the three main types of pool filter media?
- Diatomaceous earth (DE)
- Cartridge (pleated polyester)
- Sand (typically #20 silica sand)
Does LA hard water affect pool filter performance? Yes. Los Angeles water contains high levels of dissolved calcium and minerals. Our service records show this hard water accelerates calcium scaling on cartridge filter pleats, shortening cartridge life by 30 to 40 percent compared to manufacturer estimates. DE grids and sand beds hold up much better against calcium buildup, making them a better pool filter for hard water in many cases.
How often should I replace my pool filter media? Replacement intervals depend on filter type and local water conditions:
| Filter Type | Typical Media Replacement Interval | LA Hard Water Adjustment |
|---|---|---|
| DE | Grids every 3 to 5 years; DE powder after each backwash | Minimal change |
| Cartridge | Cartridge every 1 to 3 years | Replace 30 to 40% sooner |
| Sand | Sand every 5 to 7 years | Minimal change |