PENTAIR

Quad D.E.® 100

SKU: EC-188594

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Pentair
Pool Filter Size Guide

Choosing the correct pool filter ensures clear water, proper flow, and longer equipment life. An undersized filter will clog quickly and reduce circulation, while an oversized filter improves filtration and reduces maintenance.

Filter Types Explained

Cartridge Filters

  • No backwashing required
  • Excellent filtration (10-20 microns)
  • Lower water usage
  • Cleaned manually

Best for: Most residential pools, water-conscious owners

Sand Filters

  • Easy to operate
  • Backwash to clean
  • Lower filtration (20-40 microns)

Best for: Simplicity, minimal hands-on maintenance

DE (Diatomaceous Earth) Filters

  • Finest filtration (2-5 microns)
  • Backwashing + DE recharge required
  • Highest water clarity

Best for: Maximum water clarity, experienced pool owners

Filter Size by Pool Volume

Rule of thumb: Bigger is always better with filters.

Cartridge Filters (Total Square Footage)

Pool Size (Gallons) Cartridge Filter Size
Up to 15,000 100 – 150 sq. ft.
15,000 – 25,000 150 – 300 sq. ft.
25,000 – 35,000 300 – 500 sq. ft.
35,000+ 500+ sq. ft.

✔ Larger cartridges = longer time between cleanings

Sand Filters

Pool Size (Gallons) Sand Filter Size
Up to 15,000 200 lb
15,000 – 25,000 300 lb
25,000 – 35,000 350 lb
35,000+ 500+ lb

DE Filters

Pool Size (Gallons) DE Filter Size
Up to 15,000 24 sq. ft.
15,000 – 25,000 36 sq. ft.
25,000 – 35,000 48 sq. ft.
35,000+ 60 – 72 sq. ft.

Match the Filter to Your Pump

Your filter must handle the maximum flow rate (GPM) of your pump.

Plumbing Size Typical Max Flow
1 1/2″ PVC ~45 GPM
2″ PVC ~65 GPM
2 1/2″ PVC 80+ GPM

⚠️ Running a pump that exceeds the filter’s flow rating can:

  • Damage internal components
  • Reduce filtration efficiency
  • Void manufacturer warranties

Why Oversizing a Filter Is Good

✔ Cleaner water
✔ Lower pressure
✔ Longer time between cleanings/backwashing
✔ Longer filter life
✔ Better compatibility with variable-speed pumps

A larger filter paired with a lower pump speed is the most efficient setup.

Special System Considerations

You may need a larger filter if your pool has:

  • Variable-speed pump running long hours
  • In-floor cleaning system
  • Heavy debris (trees, leaves)
  • Spa spillover
  • High swimmer load

Common Filter Sizing Mistakes

❌ Matching filter size to pump HP only
❌ Choosing the minimum recommended size
❌ Ignoring maximum flow rating
❌ Underestimating debris load

✅ Always size for flow rate and pool volume

Replacing an Existing Filter?

Check the filter label for:

  • Filter type
  • Square footage (cartridge / DE)
  • Tank diameter (sand)
  • Maximum flow rate (GPM)

If you’re unsure, contact us and we’ll help you choose the correct filter.

D.E. CARTRIDGE STYLE POOL FILTER

Pentair has combined the cleaning ability of diatomaceous earth (D.E.) filters with cartridge filters into one product. The Quad D.E. pool filter delivers an exceptional pool experience using advanced pool filtration, optimal water clarity, and user-friendly cleaning features in cartridge filters.

  • Four large-capacity cartridges that capture dirt-trapping capabilities and extend intervals between cleaning.
  • The design promotes effective filtration and backwashing.
  • Constructed from chemical-resistant, fiberglass-reinforced polypropylene for durability.
  • The removable cartridge elements allow for straightforward maintenance.
  • Designed for optimal water flow, which may lead to reduced energy consumption by the pump.

PRODUCT COMPONENTS

  • Fiberglass-reinforced polypropylene tank for long life—will not corrode
  • 2” plumbing connections for maximum flow
  • 1 ½” drain for easy and efficient cleanout and 100% draining

FOUR-CARTRIDGE DESIGN

The Quad D.E. filter’s four large-capacity cartridges provide maximum filter surface area for greater dirt-trapping capacity. When water passes through these cartridges, microscopic impurities like dirt, algae and some forms of bacteria are filtered out, giving you water that really sparkles.

Additional information

Weight 90.00 lbs
Dimensions 22.50 × 22.50 × 50.50 in
Max Water Flow

Port Size

Filter Area

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