Pool Filter Comparison: Sand vs Cartridge vs DE

Your pool filter is the heart of your filtration system. It determines how clean your water is, how hard your pump works, and how much maintenance you'll be doing. But which type is best? Sand, cartridge, and DE filters each have their strengths — and their weaknesses. Here's the honest comparison from technicians who service all three every day.

Quick Comparison

Sand Filters: The Low-Maintenance Workhorse

Sand filters are the most common filter type in the US — mostly because they're cheap and simple. Water passes through a tank of #20 silica sand, and the sand grains catch debris down to about 20-40 microns.

Pros

• Cheapest to buy — $200-500 for most residential sizes
• Easiest to maintain — just backwash when pressure rises 5-10 PSI above normal
• Long-lasting sand — 5-7 years between sand changes
• Simple operation — one multiport valve, hard to mess up
• Good for large pools — handles high flow rates well

Cons

• Worst filtration — 20-40 microns means small particles pass through. Water may look slightly hazy compared to DE.
• Water waste — Backwashing uses 200-500 gallons each time. In Texas drought conditions, that adds up.
• Channeling — Water can create channels through the sand over time, reducing filtration effectiveness.
• Algae can pass through — Fine algae particles (5-10 microns) slip right through sand.

Pro tip: You can improve sand filter performance by adding a cup of DE powder through the skimmer. It coats the top layer of sand and filters down to about 5 microns. This trick works great but needs to be reapplied after each backwash.

Cartridge Filters: The Balanced Choice

Cartridge filters use pleated polyester filter elements to catch debris down to 10-20 microns — better than sand, not as fine as DE. They're increasingly popular in Texas because they don't waste water.

Pros

• No backwashing — Saves hundreds of gallons per month. Huge in drought-prone Texas.
• Better filtration than sand — 10-20 microns catches most debris
• Lower pump pressure — Less resistance means your pump works easier and lasts longer
• Energy efficient — Lower pressure = less electricity
• Compact size — Fits in smaller equipment pads

Cons

• Cartridge replacement — $50-150 per cartridge, replaced every 2-3 years
• Cleaning is manual — You have to remove and hose off the cartridges. Every 3-6 months for most pools, more often if you have trees.
• Can clog fast — After a storm or algae event, cartridges can get overwhelmed quickly
• Multiple cartridges — Larger filters use 4 cartridges that all need cleaning

Our take: Cartridge filters are the best all-around choice for most Texas pools. They balance filtration quality, water savings, and maintenance effort. We recommend them for most of our customers.

DE Filters: The Crystal Clear Option

Diatomaceous Earth (DE) filters use fossilized algae shells to filter down to 2-5 microns — that's drinking-water clarity. If you want the clearest pool on the block, DE is the way to go. But it comes with more work.

Pros

• Best filtration — 2-5 microns. Removes particles sand and cartridge can't catch. Water looks polished.
• Great for allergy sufferers — Removes the finest debris and allergens
• Efficient flow — When clean, DE offers excellent flow rates

Cons

• Most expensive — $500-1500 for the filter, plus ongoing DE powder costs
• Most maintenance — Requires backwashing and adding fresh DE after each cleaning cycle
• DE powder is messy — Fine white powder gets everywhere
• Grid replacement — DE grids need replacing every 2-3 years, $100-300
• Environmental concerns — DE powder shouldn't go down storm drains. Some municipalities restrict disposal.
• Can clog quickly — In heavy debris situations, DE filters need more frequent cleaning

Our Recommendation for Texas Pools

For most DFW pool owners, here's what we recommend:

• Cartridge filter — Best balance of performance, maintenance, and water savings. Our #1 recommendation for most pools.
• Sand filter — Good if you're on a tight budget or have a very large pool. Add DE to the skimmer for better filtration.
• DE filter — Best if you want the absolute clearest water and don't mind extra maintenance. Popular with pool owners who want showpiece water quality.

The most important thing with any filter: clean it regularly. A dirty filter of any type performs worse than a clean one of a lesser type. We include filter cleaning in our weekly service.

Need Filter Help?

If your filter isn't keeping up, you're dealing with cloudy water, or you need a filter replacement, we can help. Our equipment repair service handles all filter types — cleaning, repair, and replacement. Service calls start at $85 and all repairs come with a 1-year warranty. Call 682-399-2593 or get a free quote online.