HAYWARD

PerFlex® DE Filter 7 lb

$1,239.00

SKU: W3EC75A

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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.

Perflex Extended-Cycle D.E. filters provide crystal clear, sparkling water at an economical price. Proven over many years, Perflex has set the standard in swimming pool filtration by incorporating the patented Flex-Tube™ design in combination with D.E., the most effective filter media available. The result is superior water clarity, extended filter cleaning cycles — and no backwashing required.

Features and Benefits

  • Easy access clamp assembly
  • Cleans pools fast — removes even the smallest particles the first time through
  • Uses D.E. (diatomaceous earth), the most effective filter media available
  • Patented Flex-Tube system efficiently reuses D.E. powder and dirt mixture to form fresh cleaning surfaces
  • Exclusive bump handle activates the Flex-Tubes, causing them to instantly purge themselves of dirt and powder
  • Uniquely designed to expel any air that may be present in the system through the filtered water returning to the pool
  • Combination diffuser and lower mixing chamber specifically designed to produce a uniformed coating of D.E. on the Flex-Tubes

Additional information

Filter Area

Port Size

Max Water Flow

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