Aquasana OptimH2O Under Counter RO Water Filter System Review

    Aquasana OptimH2O

    Aquasana OptimH2O

    •    Price: $
    •    Filter Stages: 3
    •    Gallons per Day: 35
    •    NSF Standard: 42, 53, 58...
    •    Annual Costs: ~$210.00
    •    Warranty: 2 Years

    In this review, you will learn all about the advantages and drawbacks that come with the Aquasana OptimH2O RO filter system. The system features a 3-stage filtration process with an additional remineralization stage.

    • Stage 1: A basic carbon filter reduces chlorine and traps other, larger particles. As a result, your water will not only taste and smell much better, the reverse osmosis membrane at the heart of the system is also protected from aggressive substances. The benefit? You save money in the long run, because the membrane requires less frequent replacements.
    • Stage 2: The RO membrane reduces many potentially harmful impurities, such as fluoride (95.7%), nitrates & nitrites (82.40%), lead (96.6%) and arsenic (97.6%).
    • Stage 3: A Claryum® carbon filter helps to eliminate 5 times more contaminants than the RO process would alone. This includes herbicides, pesticides, chloramines, pharmaceuticals and more.
    • Stage 4: Finally, it’s time to get those healthy minerals back into your water that were lost during the filtration. The mixture of calcium, magnesium and potassium also helps to balance pH-levels and create a natural taste.

    The recommended pressure for operating the Aquasana OptimH2O is between 40 and 100 psi. Anything lower than that and you will have to use a booster pump or the filtration process will be ineffective.

    What We Like

    The full system is tested and certified to NSF standards 42, 53, 58, 401 and also conforms to NSF Protocol P473. We have to admit that we haven’t even heard of NSF Protocol P473 prior to reviewing this filtration system.

    Needless to say that, if you are looking for a water filter to finally get rid of a bunch of nasty contaminants lurking in your tap water, this is it!

    →Click here to find out what other customers are saying

    Just for clarification:

    • Standard 42 tests for the ability of a filter to remove chlorine/chloramine and other particulates from water that create unpleasant taste and odors.
    • Standard 53 tests for reduction of contaminants with health effects. These include volatile organic chemicals (VOCs), lead, cysts, asbestos, etc.
    • Standard 401 is for emerging contaminants, which have found their way into our water systems only in recent years – think herbicides, pesticides, certain pharmaceuticals, detergents.
    • Standard 58 is specifically for point-of-use RO systems. It covers material safety, structural integrity, Total Dissolved Solids (TDS) reduction and other optional contaminant reduction claims.
    • Protocol P473, which we haven’t seen before, is for PFOA and PFOS. The abbreviations stand for perfluorooctanesulfonamide and perfluorooctanesulfonic acids. Both substances are known carcinogens.

    Open the following tab to check out some of the reduction rates that the Aquasana OptimH2O was able to achieve in an independent lab test.

    Contaminant Reduction Rates

    Please note: This is only an excerpt!

    NSF Standard 42

    Chlorine: 97.66%
    Chloramines: 97.66%

    NSF Standard 53

    Cysts: 99.99%
    Mercury: >95.8%
    Lead: >99.3%
    VOCs: ~99.4%
    Asbestos: >99.0%

    NSF Standard 58

    Arsenic: 97.6%
    Chromium Hexavalent: 97.0%
    Fluoride. 95.7%
    Lead: 96.6%
    Nitrate/Nitrite: 82.40%
    Radium: 226/228 80.0%

    Standard 401

    Bisphenol A: 98.9%
    Ibuprofen: 95.4%
    TCPP: 97.8%

    NSF Protocol P473

    PFOA & PFOS: 96%

    All in all, the system is capable of removing up to 99% of 88 different contaminants. And as far as filtration capacity is concerned, it can provide up to 35 gallons of water per day. This is not as much as you will get with many other models, but for regular use it should be sufficient.

    Last but not least, Aquasana offers a 2-year limited warranty on this product, which got you covered in case something goes wrong.

    System Installation

    The full package includes the first set of filters, a lead-free faucet available in 3 different finishes to match your kitchen decor, and all the bits and pieces that are required to set everything up – at least for most customers (more on that below).

    Overall, the system is quite easy to install. All you need is some patience and you want to make sure to follow every single step as disclosed in the user manual, especially when it comes to installing the hose. By the way, we really like the manual, because it’s straight forward. And if you are stuck, don’t hesitate to contact Aquasana’s friendly customer service. From our experience, they are more than happy to answer all your questions and help you out as good as they can.

    If you’ve never drilled a hole in your life before and you haven’t heard of a tool called wrench, it’s probably a better idea to have a professional do the installation for you.

    This video explains the installation in great detail (we know the music is a bit annoying, but we couldn’t find a better one):

    Parts List

    • RO module with filter and membrane housings
    • Remineralizer
    • 2x filter cartridges
    • RO membrane
    • Brass tee
    • Drain saddle
    • Water storage tank (3.2 gallons, white)
    • Tank stand
    • Tank connector
    • Chrome faucet with quick connector
    • Color-coded tubing
    • Plumber’s tape, nuts, bolts, screws, bracket, foam seal
    • Flow restrictor & 90° elbow

    Filter/Membrane Replacements

    This system is definitely low in maintenance. The carbon housings twist off easily, which makes changing the filters a painless process.

    Here’s how often you will have to change each component as per manufacturer specifications:

    • Carbon pre-filter: About every 6 months
    • RO membrane: Every 1 to 3 years
    • Claryum post-filter: About every 6 months
    • Remineralizer: Every 12 months

    Please remember that these are only rough guideline. The exact lifetimes of the components depend on your water usage and quality.

    Annual replacement costs? About $210 which is much more than what you pay for maintaining most other RO systems.

    Aquasana OptimH2O Reverse Osmosis System

    What We Don’t Like

    Here is what we don’t like:

    • The biggest issue that we see with this filter system is that water flow is slower than average. Some customers reported that they had to wait 3 full hours to fill 2 glasses of water – that asks for a lot of patience if the storage tank is empty! Above that, low water flow also means more wastewater going down the drain.
    • Although feeling durable enough, the chrome faucet that is part of the deal looks and feels a little cheap. Switching back and forth between it and your regular kitchen faucet will make the difference even more noticeable.
    • We already mentioned above that, according to Aquasana, all parts needed for the install are supposed to be included in the package. However, this has not been the case for all customers in the past.

    On a side note: We saw many users complain about the system producing 3 gallons of waste water for every gallon of drinking water. The reason why we don’t consider this a drawback is because it’s simply how the reverse osmosis filtration process works.

    If this bothers you, you might want to think about buying an additional pump, which helps to reduce water wastage by up to 80%. Another trick is to collect the remaining wastewater in a bucket and reuse it, for example to water your garden.

    Our Verdict

    We would recommend the Aquasana OptimH2O under counter RO water filter system to anyone who doesn’t want to make any compromises when it comes to drinking water quality. 5 NSF certifications for a single filtration systems, that’s hard to find.

    And let’s not forget that the unit adds bits of healthy minerals to your water for optimum hydration. The biggest drawback? Exceptionally high maintenance costs for a 3-stage system due to overly expensive replacement parts.

    Our verdict: 3.5 out of 5 stars!

    Looking for More Product Reviews?

    If you are looking for more detailed RO system reviews, you can find our Top 10 list by following this link:!

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    And if you have any questions about the Aquasana OptimH2O reverse osmosis system or any other filter system really, please don’t hesitate to leave a comment below!

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