Unicel C-8413 Replacement Filter for Waterway 817-0125P | 125 Sq. Ft.

Overview

The Unicel C-8413 is a high-capacity pleated polyester cartridge filter element providing 125 sq ft of effective filtration area, engineered for mid- to large-residential pool circulation systems and light commercial installations. Dimensional specifications: 8.5-inch OD, 4.0-inch ID center bore, 23.25-inch overall length, with molded ABS end caps configured closed-bottom/open-top for top-load manifold seating. Media construction utilizes Reemay nonwoven spunbond polyester at a nominal 20-micron filtration efficiency, supported on a perforated polypropylene core for axial rigidity under sustained pressure differential. Rated flow capacity is 125 GPM at clean operating differential, with maximum continuous service temperature of 104°F and operating pressure range of 8–25 PSI. Pleat geometry and end-cap bonding meet OEM dimensional tolerance specifications for confirmed bypass-free seating in 4.0-inch standpipe housings.

Service interval recommendation: residential installations — pressure-differential-triggered replacement at ΔP ≥ 8–10 PSI above clean-filter operating baseline, or annual calendar replacement, whichever occurs first. Interim maintenance: rinse every 4–6 weeks under normal bather load; chemical soak using TSP or enzyme degreaser every 3–6 months to remove oils and organic surfactants resistant to mechanical rinsing. For calcium scale accumulation, the element is compatible with muriatic acid soak at 1:20 dilution (20-minute maximum exposure); rinse thoroughly with fresh water prior to reinstallation. Chemical compatibility: continuous service at ≤ 10 ppm free available chlorine or equivalent bromine concentration; enzyme cleaners compatible without restriction. Post-installation, verify clean operating pressure and document baseline ΔP for subsequent service-cycle reference. Standard Unicel 90-day manufacturer's defect warranty applies 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.