Choosing the wrong pool filter type is one of the most common mistakes in pool equipment selection. This complete 2026 guide compares cartridge, sand, and DE filters across filtration quality, water usage, maintenance requirements, and commercial suitability — with specific model recommendations and wholesale pricing.
The pool filter is the backbone of water clarity. Get it right and your pool stays crystal clear with minimal chemical intervention. Get it wrong and you'll fight algae and cloudy water constantly, regardless of how well-calibrated your chemistry is. This guide covers all three filter types in depth — cartridge, sand, and diatomaceous earth (DE) — and tells you exactly which is right for your pool type, climate, and maintenance preferences.
The Three Pool Filter Types: Quick Overview
| Filter Type | Filtration Level | Backwash Needed? | Water Usage | Maintenance Frequency | Best For |
|---|---|---|---|---|---|
| Cartridge | 10–15 microns | No | Very low (rinse only) | Clean every 4–6 months | Residential, drought areas, energy-efficient setups |
| Sand | 20–40 microns | Yes (weekly) | High (100–200 gal/backwash) | Backwash weekly, replace sand every 5 years | Budget setups, large commercial, heavy debris |
| DE (Diatomaceous Earth) | 3–5 microns | Yes (monthly) | Medium (50–100 gal/backwash) | Backwash monthly, recharge DE after each backwash | Competition pools, crystal-clear water priority |
Cartridge Filters: Best for Most Residential Pools
Cartridge filters have become the dominant choice for residential pool construction in the US over the past decade, and for good reason. They offer superior filtration to sand filters (10–15 microns vs 20–40 microns), require no backwashing (saving hundreds of gallons of water per year), and have no multiport valve to maintain. Cleaning is simple: remove the cartridge elements, rinse with a garden hose, and reinstall — a 20-minute job every 4–6 months.
Top Cartridge Filter Models 2026
| Model | Sq Ft Cartridge Area | Pool Size | Flow Rate | Wholesale Price |
|---|---|---|---|---|
| Pentair Clean & Clear Plus 320 | 320 sq ft | Up to 24,000 gal | 100 GPM | $360–$440 |
| Pentair Clean & Clear Plus 520 | 520 sq ft | Up to 40,000 gal | 150 GPM | $460–$560 |
| Hayward C4030 StarClear Plus 400 | 400 sq ft | Up to 30,000 gal | 120 GPM | $400–$490 |
| Hayward C7030 StarClear Plus 700 | 700 sq ft | Up to 50,000 gal | 175 GPM | $530–$640 |
| Jandy CS400 ClearConnect | 400 sq ft | Up to 30,000 gal | 125 GPM | $420–$510 |
A key rule in cartridge filter selection: bigger is always better. A larger cartridge area means longer time between cleanings, lower flow resistance (better pump efficiency), and longer cartridge element life. The cost difference between a 320 sq ft and 520 sq ft filter is typically only $80–$120 — worth it for the reduced maintenance interval alone.
Sand Filters: Best for Commercial High-Volume Applications
Sand filters remain the dominant choice for large commercial pools, municipal aquatic centers, and any application where high flow rate and low cost are priorities. They're simple, durable, and easy to service. The filtration quality (20–40 microns) is lower than cartridge or DE, but for a 200,000-gallon municipal pool where crystal clarity is less critical than operational simplicity and throughput, sand filters are the practical choice.
Top Sand Filter Models 2026
| Model | Tank Size | Max Flow Rate | Pool Size | Wholesale Price |
|---|---|---|---|---|
| Pentair Tagelus TA60D | 24" tank | 75 GPM | Up to 30,000 gal | $420–$520 |
| Hayward Pro Series S310S2 | 30" tank | 90 GPM | Up to 40,000 gal | $480–$590 |
| Hayward Pro Series S360SX2 | 36" tank | 150 GPM | Up to 80,000 gal | $620–$760 |
| Pentair Triton TR100 (Commercial) | 30" tank | 100 GPM | Commercial | $540–$660 |
DE Filters: Best Filtration Quality Available
Diatomaceous earth (DE) filters provide the finest filtration of any pool filter type — down to 3–5 microns. They're the standard for competition swimming pools, hotel pools where water clarity is a premium guest experience, and any application where water must be as clear as possible. The trade-off is the most complex maintenance routine: after each backwash, you must recharge the filter with fresh DE powder (a white powder added through the skimmer).
Top DE Filter Models 2026
| Model | Grid Area | Flow Rate | Pool Size | Wholesale Price |
|---|---|---|---|---|
| Pentair EC-180310 FNS Plus 60 | 60 sq ft | 60 GPM | Up to 30,000 gal | $520–$640 |
| Hayward EC65A ProGrid 65 | 65 sq ft | 65 GPM | Up to 30,000 gal | $540–$660 |
| Pentair EC-180019 FNS Plus 36 | 36 sq ft | 36 GPM | Up to 18,000 gal | $420–$510 |
How to Size Your Pool Filter
Pool filter sizing is based on the required flow rate for your pool volume and turnover rate. The filter's flow rate must meet or exceed your pump's output at your target speed.
- 1Calculate required turnover: Pool volume (gal) ÷ desired turnover time (hours) = required GPM. Example: 20,000 gal ÷ 8 hours = 2,500 GPH ÷ 60 = 41.7 GPM minimum
- 2Add 20% safety margin: 41.7 GPM × 1.20 = 50 GPM minimum filter rating
- 3Select a filter rated for at least your calculated minimum GPM
- 4For cartridge filters: also verify the cartridge area is appropriate for pool volume (oversizing is beneficial)
- 5Verify the filter's max pressure rating exceeds your pump's output pressure at the target flow rate
Where to Buy Pool Filters at Wholesale Pricing
Pool Supply Wholesalers carries the complete lines of Pentair, Hayward, and Jandy pool filters — cartridge, sand, and DE — at wholesale to retail pricing. All filters ship same-day from our Nashville TN, Los Angeles CA, Dallas TX, and Orlando FL distribution hubs. No minimum order or membership required.
Frequently Asked Questions
Which pool filter type requires the least maintenance?
Cartridge filters require the least frequent maintenance of the three types. They need cleaning every 4–6 months (or more frequently in heavily used or debris-heavy pools), which takes about 20 minutes with a garden hose. Sand filters require weekly backwashing (5–10 minutes each time, using 100–200 gallons of water). DE filters need monthly backwashing plus DE powder recharging after each backwash.
How often should I replace my pool filter cartridges?
Pool filter cartridges typically need replacement every 2–4 years depending on pool usage, water chemistry, and how frequently they're cleaned. Signs that cartridges need replacement include: pressure remaining high immediately after cleaning, visible tears or deformation in the pleated fabric, and loss of water clarity despite proper chemical balance.
Can I upgrade from a sand filter to a cartridge filter?
Yes, switching from a sand filter to a cartridge filter is a common upgrade. You'll need to install a new filter tank (sand and cartridge filters are physically different units), but the pump and plumbing connections are typically compatible. The upgrade pays back in water savings (no backwashing), better filtration quality, and reduced chemical usage within 1–3 years in most climates.
What size pool filter do I need for a 20,000 gallon pool?
For a 20,000 gallon pool with an 8-hour turnover requirement, you need a filter rated for at least 50 GPM (42 GPM minimum + 20% margin). For cartridge filters, the Pentair Clean & Clear Plus 320 (100 GPM rated) is appropriate. For sand filters, a 24" tank like the Pentair Tagelus TA60D (75 GPM) is sufficient. Always size up if budget allows — larger filters have lower flow resistance and require less frequent maintenance.
