Pentair Sta-Rite 170146 Inner & Outer Cartridge Pack (400 sq ft)
Part Number: 170146
Description
This genuine Pentair replacement cartridge pack is designed for the Sta-Rite System 3 S7M400 modular media filters. The pack includes both the inner cartridge (approximately 136 sq ft) and the outer cartridge (approximately 264 sq ft), delivering a combined 400 sq ft of filtration area.
Compatibility & Fitment
- Specifically fits Sta-Rite System 3 S7M400 filters.
- Used when filter media is worn, flow has dropped off, or cleaning frequency has increased.
- Suitable for in-ground pools where the S7M400 filter is installed.
Features & Specifications
- Total filtration area: ~400 sq ft (136 sq ft inner + 264 sq ft outer).
- Cartridges are made of reinforced pleated polyester media with durable polyurethane end caps.
- Designed for easy install and long service life before replacement.
- OEM Pentair/Sta-Rite part ensures correct fit and optimal hydraulic efficiency.
Installation Notes
Turn off the pump and relieve system pressure. Open the filter tank and remove the existing inner and outer cartridges. Inspect the housing and manifold for debris or damage. Install the new cartridges with the outer cartridge around the inner cartridge as per tank assembly, close the lid and restore circulation. Monitor filter pressure and backwash/clean when pressure rises approximately 8–10 psi above baseline.
Maintenance Tip
Clean the cartridges periodically (every 4-6 weeks depending on usage and debris load). Replace the pack when permanent loading has reduced flow and cleaning no longer restores pressure or clarity. Using the full 400 sq ft pack helps extend time between service and maintains consistent water clarity.
SKU: 170146
