Darlly Spa Pool Replacement Filter Cartridge UHD SR50 52 Sq Ft For StaRite Pentair

Upgrade your pool filtration with the Darlly UHD-SR50 replacement cartridge (80506). Designed to slot seamlessly into Sta-Rite/Pentair systems, this 52 sq ft cartridge delivers dependable filtration performance and long-lasting durability for residential pools and spas.

Key specifications at a glance

• Filtration area: 52 sq ft
• Model: UHD-SR50 (80506) – compatible with Posi-Flo TX/TXR/PTM 50 sq ft configurations
• Outer diameter: 8-11/16 inches
• Length: 13-5/16 inches
• End caps: Top open end cap; Bottom open end cap with 12 concentric slots
• Media type: 4 oz synthetic filtration media
• Compatibility: StaRite/Pentair filter housings and canister-style setups that use the UHD-SR50 family

Why this replacement stands out

The UHD-SR50 isn’t a generic add-on—it’s a purpose-built replacement for the 80506 cartridge lineage. The 52 sq ft filtration area translates to more contact time with circulating water, capturing debris more effectively while supporting steady flow and easier backwashing. The bottom end cap’s 12 concentric slots are engineered to promote even backwash distribution, helping to maintain clean pleats and consistent performance over time. With a precise 8-11/16" diameter and 13-5/16" length, it fits standard Sta-Rite/Pentair housings without modification, so you can trust a hassle-free retrofit.

Ideal use cases

• Residential in-ground or above-ground pools using Sta-Rite/Pentair cartridge systems
• Replacement for Posi-Flo TX/TXR/PTM 50 sq ft filtration setups
• Pools that demand reliable, easy-to-maintain filtration with a straightforward maintenance cycle

Benefits in practice

• Longer run times between cleanings: The generous 52 sq ft media area handles more debris before pressure rises, helping you spend less time servicing the filter.
• Direct compatibility: Specifically engineered to replace 80506 and align with Sta-Rite/Pentair systems, reducing guesswork during replacements.
• Durable, easy-care media: The 4 oz synthetic media resists breakdown and cleans up well after backwashing, restoring peak flow quickly.

Installation and maintenance tips

• Before first use, rinse the cartridge thoroughly to remove any manufacturing residues.
• Inspect seals and O-rings on your housing; replace if you notice cracks or wear to ensure a tight, leak-free fit.
• Backwash when pressure rises 8–10 psi above the clean baseline, or as recommended by your pool’s maintenance schedule.
• Regularly inspect the pleats for tears or deformities and replace the cartridge if flow becomes restricted or debris bypass increases.