Spa Filter

Whole sale spa, hot tub water filter cartridge replacements compatible with Pleatco, Unicel, Bestway and Intex. NSF 50 tested high quality. Support business bulk-buying orders. Inquire wholesale quote now.

China Factory Wholesale Unicel 4ch 21 compatible Spa Filter Replacements

China Factory Wholesale Unicel 4ch 21 compatible Spa Filter Replacements

Factory wholesale supply source of Unicel 4ch 21 comparable spa water filter cartridges. OEM, ODM and private label making is available for commercial business buying.

Product Specification:
  • Item: Spa Filter Cartridge
  • Model: PLF4CH-21
  • Replaces: Unicel 4CH-21
  • Cert.: NSF/ANSI 50
  • Sale: OEM&ODM, Whole Sale
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  1. Product Details
  2. Company Profile
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4ch 21 spa filter


Overview Introduction


1. NSF/ANSI 50 Certified

This 4ch 21 spa filter replacement is tested and certified by IAPMO against NSF/ANSI 50. We are devoted to deliver safe and clear purified water to worldwide pool and spa owners since


2. Dimension & Size

Length: 8”; Outside Diameter: 4 5/8"; Top: Circular Handle; Bottom: 1 1/2" MPT Threaded; Filtration Area: 18 sq. ft.

3. Wide Compatible Models

Our 4ch 21 spa filter replacements perfectly fit Pleatco PTL18P4, Unicel: 4CH-21, Filbur: FC-0121, SD-00845, SD-00821, SD-00838, PTL18-XP, SD-01161, PTL18-4, SD-01363. NOTE: All

trademark remain the property of their respective holder(s) and are used for compatibility information only.

4. Powerful Filtration Performance

Innovated "Dirt-Locking" technology make the fabric traps much more contaminants than regular fabric. The 4ch 21 spa filter replacement works well on filtering out hair, leaves, dust,

sediment, sand and more dirts in pool and spa water.

5. Longlasting Filtration Life

Unique Trilobal Filtration Fabric Structure make it easier to capture large volume of contiminants. It is also easy to wash/clean to recondition the filter. This filter lasts for 1-2 years when proper

maintenance is performed. We are committed to providing the best quality at good factory wholesale price.


unicel 4ch 21





  Spa Filter Cartridge




  Unicel 4ch 21


  Trilobal Structure Fabric





  Outside Diameter

  4 5/8"


  Circular Handle


  1 1/2" MPT Thread

  Filtration Area

  18 SQ.FT

  Filter Life

  Lasts for 1-2 years (depends on water quality)

  Compatible Models

  1. Unicel: 4CH-21

  2. Pleatco PTL18P4

  3. Filbur: FC-0121


  1. OEM & ODM Making

  2. Large Quantity Wholesale

  3. Private Label Manufacturing

  NOTE: All listed brands and models are used for compatibilities reference only.



Frequently Asked Questions

1. Q: What is your minimum order quantity?

     A: Normal order: 100—200 pcs; OEM order: 500 pcs

2. Q: How is your product delivered?

     A: Samples: DHL/TNT/UPS expresses; Bulk goods: sea transportation

3. Q: Is your product suitable for small businesses?

     A: We supply products for small business owners.

4. Q: Do you offer a free trial or demo of your product?

     A: We offer free samples for tests before official orders.

5. Q: Do you offer custom plans or packages for larger organizations?

     A: We support OEM, ODM, private label and packages based on requirements.

6. Q: What information should I let you know if I want to get a quotation?

     A: 1) Model number. 2) Size and dimension. 3) Function requirements. 4) The brand. 5) Quantity.



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