HQRP Spa Filter for Sundance 680 Series 5x13 2-Pack, 50 sq ft pleated media, matched 2 1/8" openings

HQRP Spa Filter for Sundance 680 Series is a two-pack replacement cartridge designed to match Sundance Spas 6540-471 fit and deliver thorough mechanical filtration for clearer hot tub water.

Keep your Sundance 680 Series hot tub running efficiently with these HQRP replacement cartridges. Each filter measures 13 5/16" long with a 5" outside diameter and 2 1/8" top and bottom openings, matching common OEM dimensions for quick, hassle-free swaps. With 50 square feet of pleated filtration media per cartridge, the HQRP units capture suspended particles, hair, oils, and debris so your circulation system and heater operate with less strain. These cartridges are sold as a convenient two-pack so you can replace both filters during routine maintenance or keep a spare on hand.

How do these filters improve water clarity and spa performance?

The pleated design increases surface area to trap more dirt without restricting flow. Cleaner water means fewer contaminants reach pumps and heaters, reducing wear and helping maintain consistent temperature. Regularly replacing cartridges also lowers the need for shock treatments and heavy chemical adjustments.

• 50 sq. ft. pleated media captures fine particles and debris
• Matched openings (2 1/8") ensure proper water flow and seal
• Maintains pump and heater efficiency by reducing clogging

Will these cartridges fit my Sundance 680 Series spa or other models?

These HQRP cartridges are made to replace the Sundance Spas 6540-471 and cross-reference common equivalents such as Pleatco PRB50-IN and Unicel C-4950. The specified length and diameter align with recommended dimensions for the 680 Series and many compatible systems that accept 5"x13" filters.

• Length: 13 5/16"; Outside diameter: 5"
• Top and bottom openings: 2 1/8" for direct replacement
• Compatible with known equivalents (Pleatco PRB50-IN, Unicel C-4950)

How do I install and care for these HQRP spa filters?

Installation is straightforward—remove the old cartridge, rinse the housing, and slide the new filter into place, aligning openings. For ongoing performance, rinse filters weekly and deep-clean monthly with a filter cleaner solution; allow to dry completely before reinstallation if soaking. Replace cartridges according to usage and water quality—typically every 6–12 months for residential spas.

• Tool-free swap: pull old filter, insert new cartridge
• Rinse weekly; use chemical cleaner monthly for buildup
• Replace both filters annually or sooner with heavy use

What materials and construction ensure durability?

These HQRP cartridges use durable pleated media and reinforced end caps to withstand high water pressure and frequent cleaning. The robust design preserves pleat shape and flow capacity through multiple maintenance cycles, extending usable service life compared with low-grade alternatives.

• Reinforced end caps resist cracking under pressure
• Pleated media retains shape for consistent filtration
• Engineered for repeated rinsing and chemical cleaning

Who is this for: The HQRP Spa Filter 2-pack is aimed at hot tub owners with Sundance 680 Series models or systems using 5"x13" cartridge filters who want an affordable, reliable replacement. It's also a practical choice for service technicians, property managers, and anyone who prefers keeping a spare filter on hand to minimize downtime. If you need a direct-fit alternative to Sundance Spas 6540-471, Pleatco PRB50-IN, or Unicel C-4950 cartridges, these HQRP units offer a straightforward swap and dependable filtration performance.