Sand vs Cartridge vs DE: Which Pool Filter Is Best in DFW?

Sand, cartridge, or DE. Every pool has one of the three, most owners inherited theirs without choosing it, and the differences genuinely matter in North Texas, where heat, dust, and a long season all push more material through your filter than a milder climate would. Here is how each one works, what it costs you in maintenance, and which one we would pick for a Plano pool.

What a pool filter is actually doing

Your sanitizer kills things. Your filter removes things. They are different jobs and neither substitutes for the other, which is why a pool with perfect chlorine and a clogged filter still looks hazy. Water leaves the pump, passes through the filter medium, and returns having left its suspended particles behind. The finer the medium, the smaller the particle it catches, and the faster it clogs.

That tradeoff is the entire comparison. Finer filtration means clearer water and more frequent cleaning. There is no filter that is both the finest and the least maintenance, and anyone selling you one is selling.

The three types side by side

Sand filters

A tank of specially graded sand. Water passes down through the bed, particles lodge between the grains, and clean water exits the bottom. To clean it you reverse the flow, which lifts the debris out and sends it to waste.

The appeal is that it is nearly foolproof. There is no medium to buy every month and no cartridge to remove and hose down in the sun. The cost is filtration fineness and water: every backwash sends a meaningful volume of your pool down the drain, and then you refill with fresh water, which in our area brings its own dissolved calcium along with it. Frequent backwashing is one of the ways calcium hardness climbs faster than owners expect, a mechanism we cover in the water chemistry guide.

Cartridge filters

A pleated fabric element in a housing. The pleats give a large surface area in a compact tank, so cartridge filters can run at lower flow resistance while catching finer material than sand.

Cleaning means shutting down, opening the housing, pulling the cartridge, and rinsing the pleats out. It takes longer than flipping a backwash valve, but it uses no pool water at all, which matters in a Texas summer and matters again if your city is under watering restrictions. This is the type we see most on newer Frisco and Prosper builds, and for good reason.

The mistake we see most: cleaning a cartridge with a pressure washer. It drives grit into the fabric and shreds the pleats. A garden hose and patience is correct.

DE (diatomaceous earth) filters

DE is a fine powder of fossilized diatom skeletons, coated onto grids inside the tank. It gives the finest filtration of the three, and a well-run DE filter produces water with a particular polished clarity that is genuinely visible.

It is also the most work. After backwashing you must recharge the filter with fresh DE, and a filter that has been backwashed but not recharged is running on bare grids and filtering poorly. Skipping the recharge is the single most common DE mistake we find on pools we take over.

The number that tells you when to clean

Regardless of type, the pressure gauge on your filter is the instrument that matters. Here is how to use it properly, which almost nobody does:

• Establish your clean baseline. Right after a thorough cleaning, with the pump running normally, note the pressure. That number is specific to your pool and equipment. Write it on the tank with a marker.
• Clean when pressure rises roughly 8 to 10 psi above that baseline. Not on a calendar. A pool under heavy cottonwood in April needs cleaning far more often than the same pool in October.
• A falling pressure with weak flow is a different problem. That points upstream, to a clogged basket or a suction-side blockage, not to a dirty filter.

Running a filter well past its cleaning point does not just cloud the water. It forces the pump to work against resistance, which is hard on the equipment. If yours is climbing fast and you are not sure why, that is worth an equipment inspection.

Which would we choose for a Plano pool?

For most homeowners here, cartridge. It filters finer than sand, uses no water to clean, and the maintenance burden is real but manageable. In a climate where evaporation and top-offs already push calcium upward, a filter that does not send pool water down the drain every few weeks is a quiet long-term advantage.

We would keep DE if you already have it and you value the clarity, as long as someone is genuinely recharging it properly. And sand remains a perfectly reasonable filter for an owner who wants the lowest-fuss option and is not chasing show-pool polish.

The honest summary: the best filter is the one that actually gets cleaned on schedule. A neglected DE filter produces worse water than a well-kept sand filter, every time. That is the part we handle as part of weekly service, so the pressure gauge never gets the chance to become your problem.