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SKU #: RNA1019

Rainshow'r Knight-Hydroponic Filter

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Rainshow'r Mfg. Co. Inc. Knight-Hydroponic Filter

The Green Knight, a non-cartridge hydroponic de-chlorinator, is designed to reduce Free Available Chlorine (FAC) in tap water when filling hydroponic nutrient tanks. Depending on the pH of the water it may also reduce chloramine compounds. The Green Knight hydroponic de-chlorinator is now molded in white UV resistant polypropylene. The green cap which distinguishes it from the Gard'n Gro is polypropylene plastic. The Green Knight has been engineered to reduce water flow to 2.5 GPM. This is to maximize water contact time with the media.


  • Unique hose saver included for hose protection and easy installation
  • Removes 85% - 90% of Free Available Chlorine (FAC)
  • Reduces chloramine 50% - 60% in pH balanced water (low seven range)
  • 30,000 Gallon or more capacity (based on water quality and usage)
  • Recommended flow rate: 2.5 Gpm
  • Temperature range: 40 F to 110 F
  • Do not allow the filter to freeze. Back flush filter monthly to preserve ideal flow rate
  • Once the filter has been used, run water through the filter at least twice monthly, or store in a refrigerator to prevent media oxidization
  • Made in USA
  • Reduces chloramine

Product Details:

  • Filter Component: Shower Filter
  • Contaminant Removal: Free Available Chlorine
  • BPA Free: Yes
  • WaterSense Compliant: Yes
  • Product Warranty: 1 year guarantee on the housing and 90 day guarantee on the RCCQ

Filter Cartridge Included

  • Cartridge Capacity in Gallons: 30000 Gallons


  • Overall: 10.25" H x 2.25" W x 2.25" D
  • Overall Product Weight: 5lbs

Special Offer:

12 Issues of Real Simple Magazine

Included with your purchase ($20 value). 

Rainshow'r Mfg. Co. Inc. Knight-Hydroponic Filter

Weights & Dimensions

  • Overall: 10.25" H x 2.25" W x 2.25" D
  • Overall Product Weight: 5lbs


Finish: WhitePrimary Material: Plastic
  • Primary Material Details: ABS
Number of Items Included: 1UV Resistant: Yes
Filter Component: Shower FilterWater Filtration Technology: KDF
Contaminant Removal: Free Available ChlorineFilter Cartridge Included: Yes
  • Cartridge Capacity in Gallons: 30000 Gallons
  • Number of Cartridges Included: 2
Filter Change Indicator: NoFittings Included: Yes
Number of Filtration Stages: 1Flow Rate: 2.5 Gallons per Minute (GPM)
Outdoor Use: YesCommercial Use: Yes
Eco-Friendly: YesCountry of Manufacture: United States


Assembly Required: NoInstallation Required: Yes
Additional Parts Required: No 


Product Warranty: 1 year guarantee on the housing and 90 day guarantee on the RCCQ 


BPA Free: YesNSF Certified: No
WaterSense Compliant: YesADA Compliant: No

About the Manufacturer

Rainshow'r is the pioneer in the shower filter industry. They are located in Southern California in the city of San Gabriel. They have been designing and manufacturing shower filters for over 20 years and have thousands of long time customers. They do not use, and will never use, activated carbon in their shower filters due to the inferior performance of carbon in a short-bodied, high temperature environment. Rainshow'r is committed to the idea that everyone deserves a safe, healthy, and chlorine free shower.

Rainshow'r Mfg. Co. Inc. Knight-Hydroponic Filter

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When you buy a Rainshow'r Knight-Hydroponic Filter online from Wayfair, we make it as easy as possible for you to find out when your product will be delivered. You can check on a delivery estimate for the Rainshow'r Part #: GK-1 here. If you have any questions about your purchase or any other Water Filtration product for sale our customer service representatives are available to help.Whether you just want to buy a Rainshow'r Knight-Hydroponic Filter or shop for your entire home, Wayfair has a zillion things home.
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Knight-Hydroponic Filter is also sometimes listed under the following manufacturer numbers: GK-1