Unicel C-9405 Replacement Filter for Pentair R173215 | 50 Sq. Ft.

Overview

The Unicel C-9405 is a pleated polyester replacement cartridge filter element engineered for residential and light commercial pool installations, delivering 50.0 sq ft of effective filtration area through a Reemay nonwoven polyester media pack with nominal 20-micron filtration efficiency. Standard dimensional specifications for this element family: 7.0-inch OD, 3.0-inch ID, 14.31-inch overall length, configured with one open end (umbrella handle) and one closed bottom end cap, both ABS injection-molded for chemical resistance and dimensional stability. The element is built on a Schedule-40 PVC central core to maintain pleat geometry under operating differential, with continuous service ratings to 104°F and operating pressures to 25 PSI. End cap bonding adhesive is UV-stabilized and resistant to degradation under standard sanitized pool water chemistry, supporting predictable performance across the full service interval.

Service interval recommendation: rinse at 4–6 week intervals or at any ΔP rise of 8–10 PSI above clean-filter operating baseline; chemical soak in dilute TSP or enzyme degreaser every 3–6 months to address oils, surfactants, and biofilm accumulation that resist water rinsing alone. Full element replacement is recommended annually under standard residential bather load, or sooner upon visual evidence of fabric tears, pleat collapse, channeling, or end cap separation. The C-9405 is compatible with muriatic acid soak at 1:20 dilution (20-minute maximum exposure) for calcium scale remediation; ABS end cap construction tolerates standard acid wash procedures without adhesive degradation. Chlorine tolerance: continuous service at ≤ 10 ppm free available chlorine; bromine and standard enzyme cleaner compatible without restriction. Backed by the standard Unicel 90-day manufacturer defect warranty through authorized distribution channels.

What's Included

Your order includes the selected quantity of replacement pool filter cartridges. Each unit is individually inspected for quality before shipping.