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Reverse Osmosis Systems

Reverse Osmosis Systems in Northern California

Water can look clear and still carry dissolved minerals, salts and other things you'd rather not drink. A reverse osmosis system under your kitchen sink gives you clean drinking water from its own faucet.

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Filling a glass with clean water at the kitchen tap

What is reverse osmosis?

Reverse osmosis uses your water pressure to push water through a very fine membrane. Clean water passes through, and what's left behind is rinsed down the drain. Before the membrane, sediment and carbon filters handle grit and chlorine. After it, our alkaline systems add minerals back for a smooth taste. Your free water test shows what's in your water before you choose.

Recommended Systems

Reverse Osmosis Drinking Water Systems

Clean drinking water at your kitchen sink. Choose our most certified system, or one with minerals added back for a smooth taste.

Premium · Most certifiedPuronics Micromax 8500 under-sink reverse osmosis system with four filter cartridges and storage tank
WQA Gold Seal certified
Puronics · Drinking Water

Puronics Micromax 8500

Our most certified drinking water system. Five stages under your kitchen sink, tested by the Water Quality Association to five NSF/ANSI standards.

  • WQA certified to NSF/ANSI 58, 53, 401 and 42, and NSF/ANSI 372 lead-free compliant
  • Five stages: sediment, activated carbon, ultra-filtration, a reverse osmosis membrane and a carbon block polisher
  • Certified under NSF/ANSI 53 for PFOA/PFOS and VOCs, and under NSF/ANSI 58 for lead, arsenic and fluoride
  • Certified under NSF/ANSI 401 for trace pharmaceuticals and BPA
  • Easy Change cartridges shut the water off as you twist them out, so filter changes are quick and clean
  • Runs on your water pressure with no electricity, and comes with its own long-neck faucet
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Under the sinkAmeriTek Alkaline Reverse Osmosis System with sediment, carbon and alkaline mineral filters
AmeriTek · Drinking Water

AmeriTek Alkaline Reverse Osmosis System

Our go-to drinking water system. Multi-stage reverse osmosis filtration followed by a natural alkaline stage, for crisp, clean water straight from your own kitchen faucet.

  • Made in the USA, as marked on the system
  • Made by AmeriTek Industries, WQA Certified Water Treatment
  • Multi-stage filtration: sediment, carbon and a reverse osmosis membrane
  • Alkaline mineral stage adds back calcium, magnesium and potassium
  • Filter change reminders on a schedule
  • Dedicated drinking water faucet at your kitchen sink
  • Great for drinking, cooking, coffee, tea and ice
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Compact cabinetAmeriTek Gold Alkaline System cabinet with chrome drinking water faucetAmeriTek Gold Alkaline System opened, showing its five filter cartridges
AmeriTek · Drinking Water

AmeriTek Gold Alkaline System

Alkaline drinking water in a sleek, enclosed cabinet built for modern kitchens. An advanced membrane built specifically for alkaline water, with high-capacity cartridges behind a hinged gold front panel.

  • Made by AmeriTek Industries, WQA Certified Water Treatment
  • Compact enclosed cabinet that fits neatly under the sink
  • Five quick-access cartridges: sediment, carbon, membrane and alkaline stages
  • Advanced molecular membrane designed in the U.S.A. for alkaline water
  • Higher-capacity cartridges for longer time between changes
  • Includes a chrome drinking water faucet
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See All Our Systems

Certified or made for it

What the Micromax 8500 is certified for

Our most certified drinking water system, tested by the Water Quality Association. Here's every certification, standard by standard.

NSF/ANSI Certified. The Water Quality Association tested it to that standard.

Made for it Made for it. What the media is built to do, without a certification for that claim.

Add-on Add-on. A second system, usually under the kitchen sink.

StandardWhat it coversCertified for
Puronics Micromax 8500
NSF/ANSI 58The standard for reverse osmosis systems.Certified Arsenic, barium, cadmium, hexavalent and trivalent chromium, copper, fluoride, lead, radium 226/228, selenium, turbidity and total dissolved solids (TDS).
NSF/ANSI 53Health-related contaminants.Certified VOCs and PFOA/PFOS.
NSF/ANSI 401Emerging contaminants.Certified Bisphenol A (BPA), estrone, ibuprofen, naproxen and nonylphenol.
NSF/ANSI 42Taste and odor.Certified Chlorine taste and odor.
NSF/ANSI 372The materials that touch your water.Lead-free Low-lead compliant.
Our other drinking water systems
AmeriTek Alkaline RO and Gold AlkalineReverse osmosis with an alkaline mineral stage.No system certificate listed Made by AmeriTek Industries, WQA Certified Water Treatment. AmeriTek doesn't list a certificate for these exact systems. Choose the Micromax 8500 for certified results.

Certified means the Water Quality Association tested the system to the NSF/ANSI standard shown. A certification lists what a system was tested for. It doesn't mean those things are in your water, and filters must be changed on schedule for the system to work as certified. Your free water test shows what is.

What comes with your RO system

A complete drinking water setup at your kitchen sink.

  1. Free in-home water test with a TDS reading
  2. Fits under your kitchen sink
  3. A dedicated drinking water faucet
  4. Certified or alkaline models to choose from
  5. Filter change reminders
  6. Financing available for up to 15 years

Getting RO at your sink

  1. 1

    Test your water

    We check your TDS and chlorine so you can see the before-and-after difference.

  2. 2

    Choose your system

    Pick from our Puronics and AmeriTek RO systems to fit your water and your kitchen.

  3. 3

    Enjoy it at your sink

    The system fits under your sink, with its own drinking water faucet.

Why go with RMZ

We test your water before and after, so you can compare the numbers at your own sink.

Book a Free Water Test

What you get with RMZ

  • A free in-home water test before we recommend anything
  • Offering whole-house water treatment systems powered by Puronics® technology, a trusted industry leader with nearly 80 years of engineering innovation since 1947.
  • thousands of homes served across Northern California
  • Puronics and AmeriTek systems, including WQA-certified Puronics softeners
  • Recommendations based on your test, and nothing you don't need
  • Softener salt delivered to your door
  • Open 7 days, 8am to 8pm · Hablamos Español

Signs it's time for better drinking water

  • You buy bottled water or fill jugs at the store
  • Your tap water tastes like chlorine, metal or just "off"
  • You want better water for coffee, tea, ice and cooking
  • You're mixing baby formula or want cleaner water for your kids
  • Your water test shows high dissolved solids (TDS)
  • You want a drinking water faucet the whole family will use

Questions about reverse osmosis

How often do the filters need changing?

Most pre-filters are changed every 12 months and the membrane less often, depending on your water and how much you use. We'll set up reminders so you never have to keep track.

Does reverse osmosis waste water?

RO systems send some water down the drain while they filter. Modern systems are much more efficient than older ones, and we'll walk you through what to expect.

Why add minerals back?

Reverse osmosis water is very pure and low in minerals. Our alkaline systems add some back for a smoother, better taste.

Have another question? Call or text (925) 421-5904, 7 days a week from 8am to 8pm.

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