Unicel 6CH-47 Replacement Filter for Advanced PTL47W-P4 (9-1 | 47 Sq. Ft.

Overview

The Unicel 6CH-47 is a pleated polyester spa cartridge filter element providing 47.0 sq ft of filtration area in a four-cartridge stack-pack configuration designed for high-flow spa and small commercial applications. Media construction is Reemay nonwoven polyester at nominal 20-micron filtration efficiency, supported on an open-bottom, threaded-top end cap geometry molded in ABS with thread-in stack interface for serviceable multi-element assembly. Dimensional specifications: 4.875-inch OD, 1.5-inch top hole with handle, 9.125-inch length per element. End cap bond is rated for continuous spa-water service at temperatures to 115°F with intermittent excursions to 120°F. The threaded stack design distributes circulation load across four elements, reducing per-element ΔP and extending service cycle length under typical spa bather loads.

Spa stack-pack elements require coordinated service across all four cartridges in the assembly: rinse with fresh water every 2–4 weeks, with chemical soak (dilute TSP or enzyme cleaner) every 4–6 weeks to remove accumulated oils, surfactants, and cosmetic residues that resist water rinsing alone. Replacement interval: 12–15 months for typical residential spa use, or at ΔP ≥ 5–8 PSI above clean operating baseline, whichever occurs first; replace all four elements concurrently to maintain balanced flow distribution across the stack. Chemical compatibility: polyester media and ABS end caps tolerate continuous service at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution compatible for calcium scale removal (20-minute maximum exposure, rinse thoroughly). Enzyme cleaner compatible without restriction. Standard Unicel 90-day manufacturing defect warranty applies through authorized distribution.

What's Included

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