PENTAIR

Triton® II TR100 Side Mount

SKU: EC-140210

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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.

FIBERGLASS SAND FILTER WITHOUT VALVES

Triton II Side Mount Filters are the original and still the industry standard. Our unique process creates a one-piece, fiberglass-reinforced tank with UV-resistant surface finish for years of unequaled strength and durability. This unique method locks in fiberglass, preventing fibers from “blooming” under harsh conditions.

  • Heavy-duty closure provides easy inspection
  • Easy-to-read pressure gauge with air relief valve
  • Instant access to sand and all internal parts
  • Internal air bleed automatically prevents unwanted air pockets
  • Combination sand and water drain makes servicing and winterizing fast and easy

Note: Operating limits—Maximum continual operating pressure of 50 psi. Maximum operating water temperature (internal filter) 104° F (40° C).

PRODUCT COMPONENTS

  • Easy access, heavy-duty closure with built-in pressure relief valve makes inspection and maintenance fast and easier
  • Threaded bulkhead connectors for easier installation and service
  • One-piece, fiberglass-reinforced tank with UV-resistant surface finish for years of unequaled strength and durability

SUPERIOR DESIGN

The Triton II filter features a special internal design that ensures all water receives maximum filtration for crystal-clear results. Plus, a flow system design controls filtration quality and ensures maximum run times between backwashing to save you time.

GLASLOK™ PROCESS

This process creates a one-piece, fiberglass-reinforced tank with a UV-resistant coating for years of dependable, corrosion-resistant service.

Additional information

Weight 65.00 lbs
Dimensions 31.50 × 31.50 × 37.50 in
Max Water Flow

Port Size

Filter Area

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