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(239) 599-8873

Remineralize Your Water

Remineralizing Filter to remineralize your water and regulating your ph.

If you’ve been researching the purchase of a reverse osmosis system for your home, you’ve likely encountered the terms Remineralized Water & Alkaline Water. Speaking from a strict chemistry perspective, these terms are often misused and misunderstood and the confusion they create can be frustrating for homeowners who just want to figure out which RO system to buy.

What does a Reverse Osmosis System remove?

It removes impurities and particles larger than .001 microns!


Basic components common to all Reverse Osmosis Systems.

Remineralized Water is water that has had some mineral content added back to it. The reverse osmosis process is non-selective – it removes the ‘good’ stuff like calcium, and magnesium, along with the ‘bad’ stuff like pesticides, heavy metals, and pharmaceuticals.  The process of a remineralizing filter is the water adds back some of the good stuff. This is usually done with a post-filter that contains some form of calcium or magnesium. The most common substances used are Calcite (calcium carbonate) and Corosex (a magnesium compound). Some filters use a combination of both. The reverse osmosis treated water is passed through one of these filters where it dissolves some of the filtration media immediately before being dispensed. Calcite remineralizes will bring the pH to neutral (about 7.0) while Corosex will bring the pH above 7. Any liquid with a pH greater than 7 is referred to as a ‘base’ although the term alkaline has replaced this word in popular discussions.

Alkaline Water is a term that needs some explanation as it is often interchanged in popular media with the term basic. In the strict scientific definition, any solution that has a pH greater than 7 is basic. Alkalinity is the acid-neutralizing capability of a solution. A solution with a basic pH and low alkalinity can have the pH altered with only a small amount of acid added. A solution with basic pH and high alkalinity can absorb a higher amount of acidic material before the pH of the solution will drift downwards.

The health effects of drinking basic pH water and/or alkaline water are not firmly established in the scientific community. What has been established is that some people find reverse osmosis water that has been remineralized to be tastier. If you want to know how remineralized filter water vs. non-remineralized RO water tastes, have a sip of Dasani water and then have a sip of Aquafina.  Both are produced through the RO process.  Dasani has some mineral content added back in and Aquafina does not. 


Reverse Osmosis Water

If you aren’t visiting our blog for the first time, you already know that reverse osmosis is the most commonly used technology to purify water.  In the process, water passes through a semipermeable membrane at relatively high pressure leaving almost all dissolved solids behind.

Various industries use RO water for their applications, but it can also be found in supermarkets in the form of bottled drinking water and many people have a ro water filter system installed under their kitchen sink.

Apart from the fact that the use of such a system increases the amount of water that gets wasted, there aren’t any drawbacks that come with it, except…

The Little Problem with Reverse Osmosis Water

Up to 99% of all Total Dissolved Solids (TDS) are removed from water during the filtration process. This does not only include harmful substances such as chemical contaminants (e.g. medication residues), but also minerals that are essential for the human body like calcium and magnesium.

In other words, reverse osmosis water is severely demineralized. This could cause problems since according to the WHO in case of “calcium and magnesium water may provide up to 20% of the required total daily intake”. What’s more, due to industrial agriculture, deficient diets, impaired digestion, and high stress levels some people may already suffer under mineral deficiency.

Please Note
The goal of this post is not to frighten anybody and we absolutely don’t know whether or not drinking RO water over a long period of time will cause any health problems, we simply want to point out the issue and provide all the necessary information you need. By the way, there is no reason to worry about mineral deficiency in regards to other minerals, because the WHO also states that “For the majority of other elements drinking water provides less than 5% of total intake”. These elements include iron, zinc, copper, iodine, phosphorus, and chloride among others.


How to Add Minerals Back to Reverse Osmosis Water

A logical solution to demineralization would be to add essential minerals back into the water after filtration. You might now think that this must be a rather complicated process – but it’s not. But before we give you 5 options on how to remineralize filter water let’s take a closer look at calcium and magnesium, which hold the highest percentage of the required total daily intake (TDI) that is provided by water.



Calcium is the most abundant mineral in the human body and accounts for 1.5 – 2.0% of our total body weight. Most of it is stored in the skeleton as a primary structural building block. Other functions of calcium are the regulation of enzymes and hormones, blood clotting, nerve transmission, and muscle/vascular contraction.

A decrease in bone mineral content, resulting in weaker bones and ultimately an increased risk for fractures are the consequences of long-term calcium deficiency.

The World Health Organization recommends a minimum of 20mg/l and an optimum of about 40-80mg/l of calcium in drinking water for a maximum beneficial health effect.



Magnesium is the second most abundant intracellular cation. 20 – 28g of magnesium is stored in our body. About 60% of it is found in the skeleton and 1% in extracellular fluid. 300 enzymatic reactions depend on magnesium and the mineral is also essential for the development of our bones.

The WHO points out that magnesium deficiency has been implicated in hypertension and type II diabetes. A low magnesium intake has been associated with an increased risk of cardiovascular diseases.

The recommended minimum amount of dissolved magnesium in drinking water is 10mg/l and the optimum amount being 20-30 mg/l.

Remineralization Filter

Now that we know how important calcium and magnesium are, how do we manage to get them back into our drinking water?

Alkalinization Stage for your RO System

If your RO system does not already feature an alkalinization stage,  one probably can be added to it without too much effort. Browse the market for a model that uses food-grade quality minerals only. Depending on your water demand the minerals will last for 6 to 12 months before you need replacement.

Also, water temperature, flow rate, and pH level (before it enters the alkalinization stage) determine how much minerals are added back into the water.

Electrolyte Blends/Trace Mineral Drops

Electrolyte blends or trace mineral drops are an easy way to quickly add elements like copper, manganese, selenium, iron, and of course calcium and magnesium into your drinking water. These blends aren’t too expensive and available at every well-sorted supermarket.

But beware: Some blends have a more balanced mineral composition than others.


Mineral-Rich Sea Salt

Another inexpensive way to meet your daily nutritional requirements is to add knifepoint of mineral-rich sea salt, such as Himalayan Salt, to each gallon of filtered water. Don’t worry, it won’t taste salty. Himalaya Salt can provide you with more than 60 different trace elements.

Attention: A processed and inferior table salt, which contains almost only sodium and chloride is not sufficient.


Green Blends

Greens blends are derived from vegetables, grasses, herbs, and more and contain minerals, fiber, and also vitamins. They are not to everybody’s taste but provide an all-around solution to remineralize your body especially after you’ve worked out.

Unfortunately, greens blends that come in powder form are costly and therefore no long-term solution for most people on a budget.

Your Turn!

You now know about the key points of demineralization and have also learned how to add minerals back into RO water. It’s your turn to make up your mind and decide what you are going to do. If remineralization is important to you, there are 5 possible solutions you can choose from.

To learn more about RO click Here

Or if you have any further questions or would like to a professional you can visit our contact page or call  (239) 599-5762

Published: April 19, 2021
Author: Crystal Clear Water
Categories : Water Facts