Unicel UHD-SR50 – 52 sq ft Replacement Cartridge Filter
Product Overview
The Unicel UHD-SR50 is a high-quality replacement cartridge designed for pool and spa filtration systems that originally use a 50–52 sq ft element. Its durable pleated polyester media provides excellent dirt-holding capacity, improved water clarity, and long service life.
Key Features
- Approximately 52 sq ft of pleated filtration surface.
- Durable, chemical-resistant end caps for long-term performance.
- Open top and bottom design for full flow and proper seating.
- Direct replacement for systems requiring a UHD-SR50-style cartridge.
- Simple drop-in installation with no modifications required.
Technical Specifications
- Part Number: UHD-SR50
- Media Area: ~52 sq ft
- Outer Diameter: Approximately 8-11/16″
- Length: Approximately 13-5/16″
- Top Opening: Approx. 4-3/16″ inner diameter
- Bottom Opening: Approx. 4-3/16″ inner diameter with slotted design
- Pleat Count: Approximately 195 pleats
Compatible Filter Models
This cartridge replaces the element used in several Sta-Rite and related systems, including:
- Sta-Rite 50TX
- Sta-Rite 50TXR
- Sta-Rite T-50TX
- Sta-Rite T-50TXR
- Sta-Rite 50GPM-TX
- PTM50 and similar 50 sq ft cartridge filter housings
Installation Instructions
- Turn off the pump and release pressure from the filter tank.
- Remove the filter lid or clamp and take out the old cartridge.
- Rinse and inspect the filter tank for debris or wear.
- Insert the UHD-SR50 cartridge, making sure it seats properly on both ends.
- Reinstall the lid or clamp, restore circulation, and confirm normal operating pressure.
Troubleshooting
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High pressure after installation: Check for closed valves, blockages, or incorrect cartridge seating.
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Low flow or cloudy water: Verify the cartridge is correctly positioned and that pleats are not damaged.
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Leaks at tank lid: Inspect O-ring, gasket, and lid seating surfaces.
Maintenance Tip
Rinse the cartridge regularly with fresh water. Use a cartridge cleaning solution as needed to remove oils and fine debris. Replace the cartridge when pleats are worn, collapsed, or when pressure remains high after cleaning.
