Sand vs Cartridge vs DE Filter
All three trap dirt, but they differ in how fine they filter, how you clean them, and how much water and money they cost over time. The right pick depends on how clear you want the water and how much maintenance you will actually do.
Side by side
| Sand | Cartridge | DE | |
|---|---|---|---|
| Filters down to | ~20–40 microns (good) | ~10–20 microns (better) | ~2–5 microns (finest) |
| How you clean it | Backwash — reverse the flow to waste | Pull the cartridge and hose it off | Backwash, then recharge with DE powder |
| Water used cleaning | Highest — backwashing dumps water | Lowest — just a hose rinse | High — backwash plus recharge |
| Media / part replacement | Replace sand every 5–7 years | Replace cartridge every 2–3 years | Grids last years; DE powder is ongoing |
| Upfront filter cost | Lowest | Mid-range | Highest |
| Effort level | Low — set and forget between backwashes | Low–mid — easy but a manual rinse | Highest — messiest to service |
| Best for | Big pools, owners who want simplicity | Owners who want fine filtration with easy cleaning | Owners who want the clearest possible water |
The verdict
you want the cheapest, lowest-fuss option and are fine with slightly coarser filtration — a solid default for most backyard pools, especially larger ones.
you want finer filtration than sand without backwashing, you are on a well or water restrictions, and you do not mind hosing a cartridge off now and then.
you want the clearest water possible and will accept the messiest maintenance and recharging DE powder after each backwash.
Pros & cons
- Cheapest to buy and maintain
- Simple, durable, forgiving
- Sand lasts 5–7 years
- Coarsest filtration of the three
- Backwashing wastes water
- Needs more chlorine help to polish water
- Fine filtration, no backwashing
- Lowest water use
- Easy to clean with a hose
- Cartridges need replacing every few years
- Deep cleaning takes time
- Can clog fast in a dirty pool
- Finest filtration — polishes water clearest
- Great for fussy or high-use pools
- Most expensive and most hands-on
- Backwash plus DE-powder recharge each time
- DE powder must be handled carefully
Sand is the low-cost, low-effort default and fine for most pools. Cartridge filters finer and skips backwashing, which is ideal where water is scarce. DE gives the clearest water but is the priciest and most hands-on. Match the filter to how clear you need the water and how much cleaning you will really do.
Common questions
Which pool filter is best overall?
There is no single best — it is a trade-off. Sand is cheapest and simplest, cartridge filters finer without wasting water, and DE gives the clearest water but needs the most maintenance. Most backyard pools do well on sand or cartridge.
Which filter gives the clearest water?
DE filters the finest, down to roughly 2–5 microns, so they produce the clearest water. Cartridge is next at about 10–20 microns, and sand is coarsest at around 20–40 microns.
Do cartridge filters use less water than sand?
Yes. Cartridge filters are cleaned by rinsing with a hose, so they avoid the backwashing that sand and DE filters use, which dumps a lot of pool water. That makes cartridge the best choice where water is limited or expensive.
How often do you replace filter media?
Sand lasts roughly 5–7 years, cartridges about 2–3 years, and DE grids last for years while the DE powder is replaced after each cleaning. Actual life depends on pool use, water balance, and how well you maintain the filter.