Crystal Quest Thunder 4000C Reverse Osmosis Water Filter with Mineralizer

List Price: $499.99
Our Price: $479.99
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The Crystal Quest Thunder 4000C water filter combines reverse osmosis, ultra-filtration, and UV sterilization in one of the most comprehensive home water purifiers available.

From fluoride to pharmaceuticals, contaminants don’t stand a chance against the Thunder 4000C. By forcing water through a semi-permeable membrane, the reverse osmosis filter removes virtually all particles as small as 1/1000 of a micron. (For reference, a human hair is about 200 microns in diameter, and anything smaller than 40 microns is invisible to the human eye.)

The Thunder 4000C utilizes activated carbon as well as copper-zinc REDOX media to produce ultra-filtered, pure water. Its ultraviolet (UV) sterilizer lamp kills 99.99% of pathogens such as bacteria, viruses, protozoa.

Additionally, this cutting-edge water filter comes with a mineralizer cartridge that restores healthy minerals to the water. Standard reverse osmosis systems remove trace minerals as well as contaminants, producing unnatural, unhealthy, acidic water. A regular habit of drinking water devoid of natural minerals (like distilled water) can rob the body of stored minerals. The Thunder 4000C remineralizes your water with natural, essential minerals like calcium, magnesium, sodium, and potassium.

How the Crystal Quest Thunder 4000C Water Filter Works

crystal quest thunder 4000 reverse osmosis water filter

Stage 1: A 1-micron solid carbon cartridge removes volatile organic compounds (VOCs), pesticides, industrial solvents, and other synthetic chemicals, as well as sediment, silt, sand, and dirt.

Stage 2: A 0.01-micron ultra-filtration membrane removes colloids, proteins, bacteria, viruses, parasites, protozoa, pyrogens, and other organic molecules and waste contaminants.

Stage 3: A 1-micron pre-filter pad removes suspended particles like sediment, rust, and dirt, as well as cysts like giardia and cryptosporidium.

Stage 4: Granulated activated carbon (GAC) made from coconut shells removes a wide range of organic contaminants, including 99.9% of chlorine and carcinogenic chlorine byproducts like trihalomethanes (THMs). GAC also removes benzene, pesticides, VOCs, PCBs, MTBEs, and hundreds of other chemical contaminants, as well as foul tastes and odors.

Stage 5: An ion exchange resin softens the water, removing heavy metals like lead, copper, and aluminum.

Stages 6 and 7: Two blocks of REDOX (oxidation-reduction) media (KDF55 and KDF85) made from copper and zinc electrochemically remove heavy metals, chlorine, algae, fungi, and hydrogen sulfide. The REDOX media also inhibits the growth of bacteria.

Stage 8: The water flows through another 1-micron filtration pad.

Stage 9: The Crystal Quest reverse osmosis membrane removes particles as small as 1/1000 of a micron, including inorganic contaminants and microorganisms.

Stage 10: The water flows through another 1-micron filtration pad to remove silt, cysts, rust, dirt, and other undissolved particles.

Stage 11: The water passes through another block of GAC.

Stage 12: The water passes through a final 1-micron filtration pad.

Stage 13: An ultraviolet (UV) sterilizer system kills 99.99% of bacteria, viruses, and protozoa without adding any harmful chemicals to your water. The hard glass germicidal lamp is enclosed in a stainless steel housing and plugs into a standard electrical outlet.

Stage 14: The water travels through a final ultra-filtration membrane to remove any remaining proteins.

Finally, the Mineralizer Cartridge remineralizes the water with natural minerals including calcium, magnesium, sodium, and potassium.

Crystal Quest Thunder 4000C Reverse Osmosis Water Filter Benefits

  • Removes over 500 contaminants from your tap water, including fluoride, chlorine, pharmaceutical pollutants, man-made toxins, microorganisms, heavy metals, and more.
  • The UV sterilizer kills 99.99% of bacteria, viruses, and parasites.
  • Easily fits under your kitchen sink.
  • After the reverse osmosis process removes trace minerals, the mineralization cartridge restores natural minerals, producing healthy, mineralized water.

Crystal Quest Thunder 4000C Reverse Osmosis Water Filter Specifications


Placement: under kitchen sink
Filtration Technology: Reverse Osmosis, Multi-Stage Ultra-Filtration, and UV Germicidal Lamp
Electricity Source:Standard electrical outlet
Water Production: up to 50 gallons per day
Tested: See independent third-party test results (PDF)
Certified: The KDF REDOX media is ANSI 61/42 certified; the granulated activated carbon media is ANSI 42 NSF certified; and the ion exchange resin is ANSI 61/42 WQA seal certified.
Maintenance: Filter cartridges will need to be replaced regularly to maintain efficiency.
Every 4 years, replace the reverse osmosis membrane.
Every 3 years, replace the ultra-filtration membrane.
Once a year, replace the carbon block cartridge, multi-stage filtration cartridge, inline GAC cartridge, UV lamp, and mineralizer cartridge.
Warranty: 1-year limited manufacturer's warranty

* Hassle-Free Cartridge Replacements * - When you purchase a water filter system from AmbrosiaWaterFilters.com, we'll automatically send you an email reminder when it's time to replace a cartridge. We take the hassle out of healthy water!

What’s Included with the Crystal Quest Thunder 4000C Reverse Osmosis Water Filter

Complete Installation Kit:

  • European-style long-reach designer faucet
  • 4-gallon steel pressurized holding tank
  • Interconnecting color-coded tubing
  • Filter cartridges
  • Ultra-filtration membrane
  • Reverse Osmosis membrane
  • UV germicidal lamp
  • Wrenches and installation hardware

While installation may be performed by a skilled do-it-yourselfer, we recommend professional installation by a licensed plumber. Attempting to install the system yourself will void the warranty.

Crystal Quest Thunder 4000C Reverse Osmosis Water Filter Reviews

We had our water tested and found high levels of fecal coliform bacteria. We don't know where the bacteria's coming from, but my wife gets sick a lot anyway because she has a weak immune system, so I knew we had to find some kind of reliable solution. Our crystal quest filter not only kills all the germs in the water but removes all the other dangerous chemicals too. Since we had the system installed my wife and I have both felt better about drinking our tap water. We can taste the difference.

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