No matter what home improvement store you walk into, there is bound to be a whole aisle of water filters. From pitchers to under-counter filters and whole-house filters, there are an incredible number of choices. And on the higher end of these choices, the words reverse osmosis keep popping up.
Is this the ultimate home water filter system? Is this THE best one out there? Is it worth buying? And more importantly, should you be buying one for your house? First, getting a clear picture of what is ro filtered water involves understanding the science behind it, and relatively objectively assessing its value.
The Science Behind Reverse Osmosis
Before we can comprehend reverse osmosis, we need to understand what it is that we are reversing. Regular osmosis is a natural phenomenon in which water tends to move from a less concentrated solution through a semipermeable membrane to a more concentrated one.
Reverse osmosis is a complete reversal of the preceding process. Pressure is applied to the source water, and an RO system pushes water molecules through a semi-permeable membrane against their concentration gradient. One stream carries the cleaned water through, and one carries the rejected solution away (left behind). This process helps clarify what is ro filtered water in practical filtration systems.
The core component of every type of RO system, the membrane, has pore sizes as small as 0.001 microns in diameter - that's approximately 70,000 times smaller than the width of a human hair. At this level of detail, an RO system can remove up to 99% of TDS - an astonishing technical feat, and lies at the very foundation of reverse osmosis water explained.
What Does RO Actually Remove?
A fully operational reverse osmosis system is capable of eliminating many types of pollutants, including: dissolved salts and minerals, toxic metals such as lead, mercury, and arsenic, fluoride, nitrates and sulfates, bacteria and other microbes (viruses, cysts, giardia, cryptosporidium), chlorine, and even many pesticides and drugs.
Most residential ROs use a multi-stage process. Usually, the water first encounters a sediment pre-filter that eliminates large visible particles such as dirt, rust, and sand. This is followed by a carbon block pre-filter that eliminates chlorine and VOCs before it encounters the RO membrane. Water then travels through the RO membrane, followed by a post-carbon polishing stage that eliminates any leftover taste or odor before ending in your glass.
The outcome is ultra-pure water, which, depending on your application, may be ideal or, more likely, undesirable. This result often comes up when discussing RO water vs filtered drinking water systems.
The Hidden Trade-Off: What RO Strips That You Actually Want
Here's the key, of reverse osmosis water that most marketing materials will handwave over: RO is blind to what dissolved solids are harmful to you.
The membrane that removes lead and arsenic also removes calcium, magnesium, and potassium - nutrients essential for bone strength, muscle contraction, and proper cardiovascular functioning. What you end up with is pure water that has all of the biologically necessary minerals removed, which raises questions about what is RO filtered water and whether it is always beneficial.
The World Health Organization has issued recommendations on the possible health risks of consuming water with low mineralization for a long period of time. The main tension in the RO water v filtered debate is that the lines between good and bad water are much more blurred. One need only consider the spectrum of carbon dioxide levels in tap water to appreciate this. I have assembled a simple tabulated representation below to make this point clearer.
The Practical Realities of Home RO Systems
In addition to mineral removal, some real-world constraints of residential reverse osmosis can surprise potential buyers.
Cost - A good under-sink RO unit will cost between $300 and $1,000 for the actual system, not including installation. The installation itself may also cost hundreds of dollars.
Unnecessary water waste - Typical RO systems may dispose of two to four gallons of water to produce one gallon of purified water. For people who are trying to be efficient, that could be significant consumption.
Electricity - Several home RO systems utilize a booster pump that must be energized continuously to work against the pressure build-up.
Portability - RO isn't portable. It sits in one place (i.e. It can't be moved); it doesn't work in rental homes without landlord approval of installation; not suitable for apartments with a narrow under-sink cabinet.
Truly considers RO water vs filter gravity options, these realities are just as important as the performance specifications when evaluating what is RO filtered water systems.
So - Do You Actually Need RO?
What is RO filtered water? We know it's appropriate when the Water source has a very high dissolved solids level to a great extent, or with certain industrial-grade impurities of great concern level, or a very poor source of water.
For most American households relying on municipal water, the real pollutants are the chlorine byproducts, such as the THMs, PFAS, heavy metals, micro plastics, and drugs and chemicals, not huge mineral loads. This is what activated carbon block is great for, and without the cost, waste,e or removal of mineral load or the hassle of reverse osmosis. This comparison frequently appears in discussions about RO water vs filtered water choices.
A Smarter Choice for Most American Homes: Phoenix Gravity
If you're a household seeking total filtration without the tradeoffs of reverse osmosis, you should seriously consider Phoenix Gravity Water Filters. They're an American-founded company that has been around for over 50 years of research and development using their dual-stage coconut shell activated carbon block technology that eliminates chlorine, PFAS, THMs, heavy metals, microplastics, and pharmaceutical residues while preserving all of the water's natural mineral content.
No electricity. No water waste. No plumber. Stainless steel housings, .05/gal, 10-year warranty, 100-day money-back trial. This is what reverse osmosis water explained looks like in comparison - and it's the smarter, more approachable solution for the average American household. It also helps clarify what is ro filtered water when contrasted with alternative filtration approaches.
Contact Phoenix Gravity today.
Final Thought
All true, but reverse osmosis is really impressive - being impressive, however, isn't always an argument for being the right solution. For most American families on city water, the more sensible question isn't "how do I end up with the purest water at the tap?" but rather "how do I end up with the safest, most balanced, most practical water at the tap every day?"
The best answer might not include a $1,000 installation, a plumber, and a system that uses three gallons of water for each one it freshens. Sometimes, it means knowing what's in your water to begin with-and picking a system tailored exactly for that. When comparing Reverse Osmosis water vs filtration with gravity, the best answer is all about your water and the way you live. For most Americans, it's simpler and more intelligent.
Frequently Asked Questions
Q1. What is RO filtered water? How does it differ from regular filtered water?
RO filtered water boils to the basic principle: it has few other solutes than the added nutrients. For water, the principle is that reverse osmosis relies on high pressure and a semi-permeable membrane to remove up to 99% of up to 97 other dissolved solids from the water. Regular carbon block filtration also relies on adsorption, a process by which one substance tends to be removed by adsorbing onto the surface of another substance in a mutual attractive force that collects harmful contaminants. It's different between 99% out of other dissolved solids for reverse osmosis and extremely selective for not needing solid filtration.
Q2. Will RO eliminate all the undesirable substances from your tap water?
While it takes up the lion's share in removing dry solids, heavy metals, nitrates, fluoride, bacteria/viruses, etc., it can also allow some volatile organic chemicals to be dissolved if a carbon pre-filter isn't installed. As you'll find, it's virtually impossible to have one technology that will eliminate everything, which is where multi-stage setups integrated with other forms of water filtration tend to work the best at providing comprehensive filtration against contaminants you may have in your water.
Q3. Can you drink long-term RO water?
This is the complicated aspect of Reverse Osmosis water that we have explained. As most of the nasty dissolved pollutants are not present in RO water, the challenge around long-term drinking of excessively demineralized water goes back to Health considerations around mineral and electrolyte balance. Many now include a remineralization phase in the Water Filter system to help address this, which, of course, costs more. With our reverse osmosis water versus filter water debate, systems that do not remove all of the natural minerals avoid this issue altogether.
Q4. Why does Phoenix Gravity not use RO technology?
The actual contamination profile in American municipal tap water is not that there are high levels of all dissolved minerals, but that the key hazardous chemicals are chlorine derivatives, PFAS, heavy metals, and microplastics. The activated carbon block filtration effectively neutralizes the quantities of these chemicals in tap water without the wastage of water, removal of all dissolved minerals, or need for an electrical source. This is not a blind zeal for simple technology, but an informed and intentional choice based on over 50 years of US global impact filtration research.
Q5. How about comparing Phoenix Gravity against RO according to its cost and convenience?
If one goes looking for a decent RO, then he will find that it costs anything between $300-$1,000+ to install an RO, and you also throw out between 2 to 4 gallons of water for every one gallon you consume, not to mention its enormous electricity bills, and it needs a professional to fit it. PBeforethat, with the preference always being for a gravity fed filter, (which wastes no water and involves zero installation, assembled within five minutes by oneself without any tools and produces filtered water at an approximate cost of $0.05 per gallon, after all of which you are molly down for the next 10 years with a money back guarantee in 100 days), "Phoenix Waters" attracts every single cost and convenience factor in comparison to an average American household.