Aquasana OptimH2O Detailed Review & Specs

In Brief: Review of the Aquasana OptimH2O

If you are looking for an efficient, reverse osmosis system for home use, you will definitely want to consider the Aquasana OptimH20. It is affordable, easy to maintain, and carries a hassle-free warranty. However, you need to note that the filter doesn’t have the best flow rate and that its installation can be a bit challenging.

Aquasana is one of the most popular brands in the US water filtration market.

Founded in the year 1998, the company manufactures and sells a wide range of water filtration products, including softeners, purifiers, water filters, etc.

Their headquarter is located in Austin, Texas.

The Aquasana OptimH20 is a compact under sink water filter that delivers the ultimately pure and healthy water you need for peak hydration.

It gets rid of chlorine, fluoride, lead, and other nasty contaminants in the water while leaving out beneficial minerals that would have otherwise been removed by other RO filters.

This 3-stage water filtration system is not only easy to install but also simple to replace and maintain.

Key Specifications of the Aquasana OptimH2O Water Filter

Aquasana OptimH2O Reverse Osmosis Under Sink Water Filter System - Filters 95% Of Fluoride - Kitchen Counter Faucet Filtration - Brushed Nickel - AQ-RO-3.55

The OptimH2O comes with plenty of impressive features that make it one of the best reverse osmosis water filters around.

It tips the scale at 12.3 pounds and measures 12 x 4.5 x 12.5 inches in dimension, so it won’t take up too much space under your kitchen sink.

It combines reverse osmosis and Claryum technology, which enables it to remove more than 78 contaminants, including chlorine, lead, fluoride, mercury, arsenic, and other water-soluble metals.

Also, the filter rids the water of bacteria, nitrates, nitrates, herbicides, preservatives, and so on.

One great thing about this system is that it also remineralizes water, putting back minerals like calcium, magnesium, and potassium that might have been lost to the reverse osmosis process.

This helps improve the pH of drinking water and gives it a more natural-like taste. With a daily production of around 11-32 gallons, the water filter puts out enough water to meet the demands of an average-size family or household.

And, its flow rate of 0.8 gallons per minute is among the fastest in the market, guaranteeing you a decent amount of clean, drinkable water when you need it.

The Aquasana OptimH2O comes with filter housings that are easy to twist off, making filter replacement a breeze.

Plus, it has stylish, lead-free faucets in different finishes, so you can easily find the one that best matches your current kitchen décor.

Last but not least, the filter carries a two-year warranty and a 90-day money-back guarantee.

Detailed specification sheet of OmptimH20 –

Capacity11-32 gallons per day
Storage Tank Capacity3.2 gallons
Maximum TDS1000ppm
Product Dimension
12″w x 14.5″h x 4.5″d
Weight 12.3 lbs
Warranty2 years

What Impurities does it remove, and what are the Benefits?

This premium filtration system removes a wide range of impurities, such as chlorine, fluoride, mercury, lead, nitrates, arsenic, bacteria, virus, and other contaminants.

So, you get clean and healthy water that is 100 percent safe for drinking. Besides, the purified water tastes great, cooks better, and retains beneficial minerals that can help ensure shiner skin and hair.


Aquasana offers a 90-day money-back guarantee if not satisfied with the product within three months of purchase and a 2-year warranty should any of the parts go out of order.

Note that the warranty does not cover product failure due to improper installation or use.

To know more about the warranty and its conditions, please visit website>

How to Assemble/Install the Aquasana OptimH20

The full package comes with the bits and pieces needed for a successful installation.

The Aquasana OptimH20 is a bit tricky to install since, unlike other RO systems, it requires a hole of about 1.5 to 1.65 inches.

If the water tap already has a suitable hole, installing this water filter is pretty straightforward.

Anyone with a reasonable DIY experience will be able to do it, but you may need to hire a professional plumber if some drilling is required.

For more information on how to assemble the unit, please check this YouTube video:



Customer Review Analysis

We combed several online retail portals and forums to find out what customers are saying about the Aquasana OptimH20 water filter.

Our analysis shows that most buyers consider the product one of the best reverse osmosis filters in the market and rate it very highly.

They like the fact that it removes different types of impurities in water and that the filters are super easy to replace and maintain.

Buyers also appreciate the long-term warranty and the stylish design that blends well with most kitchen décors.

However, the Aquasana water filter did receive some negative feedback from customers. A lot of users have difficulties installing this unit.

Plus, they complained that the water flow rate is much lower than advertised and that frequent replacement of filters is usually needed.

Nevertheless, the OptimH20 is a decent-quality reverse osmosis water filter and has a good approval rating among buyers.


Pros/Cons of the Aquasana OptimH2O

Below are the good and not-so-good things about this water filter based on hundreds of customer reviews, expert comments, and the product specifications:


  • Removes up to 95 percent fluoride and other contaminants
  • Remineralizes water
  • Easy to replace
  • Affordably priced
  • Comes with a warranty


  • Frequent filter changes can be expensive
  • Tricky to install


Recommended Accessories for the Aquasana OptimH20

Here is a list of products commonly bought together with this water filter: Aquasana Replacement Filters Stage 1 and 3 Aquasana Replacement Filters Stage 1 and 3 for Aquasana OptimH20 Reverse Osmosis Water Filter


Aquasana Replacement Remineralizer Aquasana Replacement Remineralizer for Aquasana OptimH20 Reverse Osmosis Water Filter



Does the product come with installation instructions?

Sure. The water filter includes a detailed manual that explains and outlines each step of the entire installation process.

How much water is wasted in the process of being filtered?

According to the manufacturer, the reverse osmosis system generates 3 gallons of wastewater per each gallon of pure, drinkable water.

How often should you replace filters?

The Claryum and carbon filters have a short lifespan and should be replaced every six months.


The Aquasana OptimH2O is an excellent reverse osmosis water filter.

It removes fluoride, chlorine, metals, and other contaminants from water and remineralizes water to ensure that healthy minerals are not lost in the filtration process.

On top of that, it comes from a reputable USA based brand and carries a long-term warranty.

It is therefore recommended for health-conscious consumers who are shopping for the best RO water filtration system sold at an affordable price.

Last update on 2021-06-16 / Affiliate links / Images from Amazon Product Advertising API

Sheila Smith
About Sheila Smith

Sheila is an experienced writer and has written extensively on home improvement products, home appliances, and tools. A DIYer herself, she brings extensive experience related to selection, installation, and troubleshooting appliances.

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