POOLPURE PLF4CH-22 Spa Filter | 25 Sq Ft Replacement for PFF25P4 & Unicel 4CH-22

Overview

Meet the POOLPURE PLF4CH-22 Spa Filter, a 25 square foot replacement cartridge designed to fit a wide range of OEM models while supporting consistently clean water in your spa or hot tub. This filter is built to deliver dependable performance without locking you into a specific brand, offering a flexible solution for maintenance routines and seasonal use.

Certified quality and key specs

Certified to NSF/ANSI 50 by IAPMO, POOLPURE emphasizes reliability and water clarity. The cartridge measures 6 5/8 inches in length with a 4 5/8 inch outer diameter. Top opening is 2 1/8 inches and bottom thread is 1 1/2 inches MPT. The filtration area is 25 square feet and the filtration fabric is trilobal.

What makes this filter stand out

• Dirt-Locking technology captures more debris than typical cartridges, helping keep spa water clean and inviting.
• The trilobal filtration fabric supports easy release of trapped impurities during cleaning, helping the cartridge feel like new after each rinse.
• Compatibility is broad, including PFF25P4, Unicel 4CH-22, Filbur FC-2399 and several other OEM models. POOLPURE remains a separate brand offering OEM-aligned replacements.
• Trusted by millions of pool and spa owners worldwide, reflecting long standing performance and dependable filtration in diverse environments.
• Real world testing and media recognition, including features with an Olympic athlete and NBC Local coverage, underscoring consistent filtration quality.
• Active industry support as a PHTA member, signaling alignment with recognized filtration standards and best practices.

Care and maintenance

• For best results, clean the cartridge once a month to maintain flow and filtration efficiency.
• Do not backwash the PLF4CH-22; backwashing can cause cracks or permanent damage.
• Keep the cartridge dry and store properly when not in use to prolong life.

What to expect in your spa

With proper care, you may notice crisper water clarity and a smoother filter operation during spa sessions. The cartridge is designed to balance performance with an approachable maintenance routine, making it a practical option for regular upkeep or seasonal draining. Its 25 sq ft filtration area supports steady flow, while the robust fabric and dirt-locking design contribute to reliable filtration across multiple spa cycles.