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Water filter pitchers are portable, lightweight, and easy to use.
Besides, quality units can remove several contaminants from water, including lead, chromium 6, pesticides, and chlorine.
Still, because reverse osmosis is one of the most effective ways to purify water, people wonder if something like a reverse osmosis water filter pitcher exists.
If you’re in the same boat, read below to find out.
Reverse osmosis systems provide highly pure and healthy drinking water. As such, homeowners wonder if reverse osmosis water purification works with filter pitchers.
Unfortunately, it doesn’t. There is no such thing as a reverse osmosis water filter pitcher.
RO systems typically purify water very slowly, need high water pressure, and also produce wastewater (more on these topics below).
Therefore, combining RO filtration technology with water filter pitchers simply isn’t doable.
However, it doesn’t indicate that pitchers alone cannot remove the contaminants lurking in your water supply. In fact, a few premium filter pitchers reduce most water pollutants and resolve aesthetic water issues pretty effectively.
Any RO water purification process requires high water pressure in order to function properly. For this reason alone, a direct connection to a home water supply is needed.
The bare minimum pressure with most RO systems is 40 psi. However, to make the filtration process more efficient, 60 psi works even better.
Pitchers, on the other hand, work based on gravity. Simply put, the only force that pushes a relatively small amount of water through the filter media is one caused by gravity – which certainly isn’t high.
So even if given a try somehow, the process would be highly uneconomical.
What’s more, a reverse osmosis system eliminates more impurities and wastes less water the higher the feed water pressure. Granted, factors like solute concentration, membrane pore size, and feed water temperature also come into play.
Still, RO water treatment using a filter pitcher would be subpar to say the least, and would likely waste 20 or more gallons of water for every gallon purified.
(Note that 20 gallons is only a rough estimate. At 60 psi water pressure, a standard reverse osmosis system wastes around 4 gallons for every clean gallon.)
Speaking of wastewater…
Water molecules diffuse through the semipermeable RO membrane leaving all contaminants behind. However, all water cannot diffuse. Some of it stays on the membrane’s entry side. As the purification process continues, this water collects more and more contaminants.
The water left behind is often referred to as “concentrate” or “brine”. The water that has crossed the membrane is called “permeate”.
Now, the brine water needs to go somewhere. That’s why reverse osmosis systems use a drain line. Essentially, all the wastewater passes down the drain line and into your kitchen sink’s drain.
A water filter pitcher does not have a drain connection, obviously. So where to put the wastewater?
You’d require a drain connection for the pitcher if the brine could be somehow routed out without polluting the purified water.
Though pretty effective for treating contaminated water, RO systems work incredibly slowly. Thus, such systems include a storage tank to store water for future demand.
Yes, RO systems that come with a water pressure pump do not require a tank. But this would be impossible to realize in a water filter pitcher.
As such, one would need to wait a long time to get filtered water from an RO pitcher.
A reverse osmosis system features multiple filter stages to ensure broad contaminant removal. So aside from the RO membrane itself, a few commonly used filter stages include sediment pre-filters, granular activated carbon pre-filters, and carbon block post-filters.
It’s hard to imagine where to put all that in a small-sized filter pitcher.
Not all water filter pitchers remove the same contaminants. Basic models only improve the taste and smell of water, while certain powerful units from specific brands can eliminate tons of water pollutants, including:
Here is what reverse osmosis systems can remove from water:
Please note: The RO membrane alone does not eliminate all the above contaminants. Such broad removal is only possible because RO systems combine several filtration stages.
In fact, RO membranes are rather delicate and prone to damage when getting in contact with certain chemicals like chlorine. As such, these chemicals need to be removed in the pre-filter stages.
Both RO systems and filter pitchers have advantages and disadvantages. However, the fitness of both systems can be determined by what you want to remove from your water.
In other words, some contaminants require reverse osmosis for removal, while others might best be eliminated using a pitcher.
Here are some advantages and disadvantages of using water filter pitchers:
Advantages and disadvantages of reverse osmosis systems include:
If you have any thoughts about the question, is there a reverse osmosis water pitcher, please don’t hesitate to leave a comment below!