Crystal Quest Thunder 4000 GPD Whole House Reverse Osmosis Water Filter


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We recommend this model with a 220 gallon storage tank for homes with 1 to 2 bath rooms

Our Whole House Reverse Osmosis System is the highest performing RO System on the market backed by more than 25 years of experience. It has been designed and engineered to provide purified water throughout your entire home for many years if properly maintained.

Every system is tested in-house before it is shipped and arrives operational, requiring minimal plumbing. As long as the prefilters and membranes are changed regularly, these systems should last from 15-20 years.

All our RO systems are designed to be modular, require little operational maintenance, and be economical. We understand that this is a long-lasting investment for both your family and home -- and we aim to make sure you are getting the best possible return on your investment!

Endless Possibilities
It isn't always easy finding a perfect fit, but with 9 different flow rates to choose from, we have a system that will meet your homes' exact needs.

Storage Tank Kit Components

  • The RO System - A commercial-grade RO System ranging from 200-7,000 GPD. Every system is equipped with prefiltration to extend the life of the membranes.

  • Water Tank - Water is stored in an atmospheric water storage tank (165, 220, or 550 gallons) that is sized depending on your system.

  • Pump - As water is used within your home, it will be pumped from the tank as needed.

  • Float Switches - Used within your water tank, this regulates when your RO System needs to cut on and off depending on the water level in your tank.

System Benefits

  • Compact, Space Saving

  • Easily Accessible Components

  • Expandable and Lightweight Design

  • Fully Equipped and Customizable

  • Low Operational Costs

  • Low cost of Maintenance
  • Easily Maintenance and servicing
  • Factory Tested and Preserved
  • CE Compliant
  • Made in the USA

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Installation Manual

Optional Add-Ons
12 GPM UV Water Sterilizer
For added protection, we offer a premium UV sterilizer to prevent microbiological contamination.

Alkalizing Postfilter
Enhance the alkalinity of your water before it enters your home with the added benefits of a natural Alkalizing, Mineralizing, and Oxidation Whole House filter.

Operating Specs*

Name Value
Weight (lbs) 50-265
Motor (hp) 0-1.5
Voltage 110V/220V*
Hertz 50 or 60
Feed Connection 3/8" or 1"
Product Connection 3/8" or 1"
Waste Connection 1/4", 3/8", or 1"
Min. Feed Pressure (psi) 45
Min. NaCl Rejection 96%
Max. NaCl Rejection 98.5%
Min. Feed (gpm) 1-10
Max. Hardness (grains/gallon) 15
Max. TDS (ppm) 1000-2000
Operating Pressure (psi) 50-150
pH range 3-11

Optional Upgrades:
All systems include a standard with a wide range of features. There are various options and upgrades available to accommodate a diverse range of water treatment applications. Listed below is a selection of the most popular upgrades.

  • Stainless-Steel Rotary Vane Pump: Offers a longer lifespan and increase resistance to high TDS feed water and corrosive materials, such as dosing chemical and antiscalants.

  • Concentrate recycle valve: Allows for an increase of RO systems efficiency by recycling back wastewater into the feed stream and increasing the system recovery

  • SWP Digital Dual TDS Controller: Allow for simultaneous monitoring of both feed TDS and permeate TDS levels, helping to monitor the RO system salt rejection and membrane performance.

  • SWP Digital TDS Controller: Allow for monitoring either feed TDS and Permeate TDS levels

  • SWP Digital TDS/Conductivity Controller: Allow for the monitoring of the RO permeate water TDS and conductivity levels, useful in evaluating overall system performance IF Computer Controller with feed flush: Allow for pre-treatment lockout functionality, tank level input, features a convenient LED status display indicator for increase ease of use.

  • S150 Computer Controller with Feed Flush: Allow for pre-treatment lockout functionality, tank level input, features a convenient LED status display and alarm function.

  • Chemical Pump Outlet: Provide an integrated power source with the RO system for connection of a chemical feed pump.

  • Blending Valve: Allows for a mixture of feed water into final RO permeate water to achieve desirable permeate TDS.

  • Permeate Sample Port: Allows for evaluation of individual membrane performance in on RO system and aids in system troubleshooting and maintenance.

  • 240V 50-60Hz or 110V 50-60Hz: Allow for selecting sufficient voltage and hertz use requirement.

  • Single Wood Crate

All systems are rated with 77 Degree Farenheight water and TDS (total dissolved solids) under 2000. Please refer to the specifications of the exact system you plan to purchase. If your water falls outside of these constraints, you should contact us for more recommendations

Crystal Quest Thunder 4000 GPD Whole House Reverse Osmosis Water Filter

Crystal Quest Thunder 4000 GPD Whole House Reverse Osmosis Water Filter


Atmospheric Storage Tanks


 165 Gallons Atmospheric Storage Tank


 220 Gallons Atmospheric Storage Tank


 550 Gallons Atmospheric Storage Tank


Storage Tanks & Pumps


 165 Gallons Atmospheric Storage Tank with pump


 220 Gallons Atmospheric Storage Tank with pump


 550 Gallons Atmospheric Storage Tank with pump



R/O Replacement Cartridge Filters



Pleated Cellulose Sediment Cartridge 4 5/8" x 20"


5-Micron Carbon Block Filter Cartridge 4 5/8" x 20"


12 GPM Ultraviolet Water Sterilizer


 12 GPM Ultraviolet Water Sterilizer System 110v


 12 GPM Ultraviolet Water Sterilizer System 220v


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