Product Overview

The Sta-Rite Modular Media Replacement Cartridge Set 170147 is the genuine OEM replacement cartridge package for the Sta-Rite System:3 S8M150 Modular Media Filter.

This complete set includes the filter’s inner and outer cartridge elements, providing a combined filtration area of 450 square feet. The nested modular design delivers a large amount of filtration capacity within the compact System:3 filter tank while helping capture dirt, oils, debris, and other contaminants from pool water.

Replacing both cartridges together helps restore proper filtration performance, improve water clarity, and reduce excessive system pressure caused by worn, damaged, or heavily contaminated filter media.

Key Features

• Genuine Pentair and Sta-Rite replacement cartridge set
• Designed specifically for the System:3 S8M150 filter
• Includes one inner cartridge and one outer cartridge
• Provides 450 sq. ft. of total filtration area
• Inner cartridge provides 191 sq. ft. of filtration
• Outer cartridge provides 259 sq. ft. of filtration
• Direct replacement for the original factory cartridge elements
• Pleated filter media captures dirt and suspended contaminants
• Reusable and washable cartridge design
• No sand, D.E. powder, or backwashing required
• Helps restore proper water flow and filtration performance
• Suitable for residential swimming-pool filtration systems

Benefits

• Restores filtration performance in an existing S8M150 filter
• Helps improve pool-water clarity
• Large filtration area supports longer cleaning cycles
• Complete set eliminates the need to order cartridges separately
• Genuine OEM fit helps prevent installation and sealing issues
• Washable media allows the cartridges to be cleaned and reused
• Reduces water waste compared with filters that require backwashing
• Nested cartridge design provides high capacity in a compact housing

Specifications

Compatible Equipment

This replacement cartridge set is designed for:

• Sta-Rite System:3 S8M150 Modular Media Filter

The 170147 set is not intended for the smaller S7M120 System:3 filter. Confirm the model number printed on the filter label before ordering.

Included in the Set

The package includes:

• One 191 sq. ft. inner cartridge
• One 259 sq. ft. outer cartridge

The two cartridges provide a combined filtration area of 450 square feet.

This listing is for the replacement cartridge elements only. The filter tank, lid, clamp, O-rings, gauges, plumbing components, and other filter parts are not included unless specifically stated.

When to Replace the Cartridges

Replacement may be necessary when:

• Filter pressure remains high after cleaning
• Water flow is lower than normal
• The pleated media is torn, cracked, or deteriorated
• Cartridge bands or end caps are damaged
• The cartridges no longer clean completely
• Pool water remains cloudy despite balanced chemistry
• Cleaning cycles have become unusually frequent
• The cartridges have become coated with oils, scale, or embedded debris

Pool-water problems may also be caused by improper chemistry, circulation issues, pump problems, or incorrect operating times. Inspect the complete filtration system before assuming the cartridges are the only cause.

Cleaning and Maintenance

Turn off the pool pump and release all internal filter pressure before opening the filter.

Remove the cartridges and rinse between the pleats using a garden hose. Work from the top downward and clean the entire surface of both cartridges. Avoid using a high-pressure washer because excessive pressure may damage the filter media.

For cartridges contaminated with oils or lotions, use an approved cartridge-cleaning solution. Calcium or mineral deposits may require additional treatment after oils have been removed.

Never mix cleaning chemicals. Follow all chemical-manufacturer instructions and rinse the cartridges thoroughly before reinstalling them.

Inspect the filter tank O-ring and sealing surfaces during each service. Replace worn or damaged sealing components as needed.

Installation Information

Installation generally requires:

1. Turning off power to the circulation pump.
2. Opening the air-relief valve.
3. Confirming that all filter pressure has been released.
4. Removing the filter closure according to the manufacturer’s instructions.
5. Removing the old inner and outer cartridges.
6. Cleaning the filter tank and inspecting internal components.
7. Installing the new cartridge elements in the correct positions.
8. Inspecting and lubricating the tank O-ring with an approved lubricant.
9. Reassembling the filter correctly.
10. Restarting the system and checking for leaks.

Never loosen or remove the filter closure while the system is operating or pressurized.

Confirm Before Ordering

Please verify the following before purchasing:

• Your filter model is Sta-Rite System:3 S8M150.
• You need the complete inner and outer cartridge set.
• Your required replacement part number is 170147.
• You are not ordering cartridges for an S7M120 filter.
• The filter tank and internal components are in serviceable condition.
• You do not need additional O-rings, gauges, air-relief parts, or tank components.

Filter cartridges may appear similar but differ in dimensions, end-cap configuration, and filtration area. Match the filter model and OEM part number rather than relying only on appearance.

Warranty Information

This replacement cartridge set is covered by the manufacturer’s limited warranty against qualifying manufacturing defects, subject to Pentair’s current warranty terms and conditions.

Normal wear, improper installation, chemical damage, freezing, excessive system pressure, improper cleaning, misuse, or damage caused by incompatible equipment may not be covered.

Warranty coverage does not extend to routine cartridge replacement resulting from normal use.

Customer Q&A

How many square feet is the 170147 cartridge set?

The complete set provides 450 square feet of filtration area.

How is the filtration area divided?

The inner cartridge provides 191 sq. ft., and the outer cartridge provides 259 sq. ft.

Does this set include both cartridges?

Yes. The 170147 set includes one inner cartridge and one outer cartridge.

Which filter does this cartridge set fit?

It fits the Sta-Rite System:3 S8M150 Modular Media Filter.

Does it fit the S7M120 filter?

No. The S7M120 uses a different replacement cartridge set. Verify the model label before ordering.

Are these cartridges washable?

Yes. Both cartridge elements can be removed, rinsed, cleaned, and reused until the media or structural components become damaged or worn.

Does this listing include the filter tank?

No. This listing is for the inner and outer replacement cartridge elements only.

Do I need D.E. powder with these cartridges?

No. The S8M150 Modular Media Filter uses cartridge elements and does not require D.E. powder.