A netizen posted a question online:
I’m renovating my new home and planning to install a kitchen under-sink water purifier, but I’m confused by various filter core technologies. The water hardness in my community is relatively high. How to choose a home water purifier to avoid pitfalls, and which is better between RO and ultrafiltration?
One reply under the post read:
There’s no need to install a pipe water dispenser at home, because it would removes beneficial minerals from the water. Long-term consumption of pure water will lead to mineral deficiency in the body. When choosing between RO Reverse Osmosis System and ultrafiltration for a water purifier, RO system is definitely the way to go.
But please note to use tap water for cooking and washing vegetables, and just match a drinking water system with an RO reverse osmosis water purifier, there’s no need for a pipe water dispenser. This meets the high water quality requirements for making tea, brewing milk powder, brewing coffee, etc. Combining purified water with tap water solves the problem of water nutrient balance.
Hope this helps.
At first sight, this response sounds sensible and the commenter seems quite knowledgeable about water purifiers, but it’s actually contradictory, as they even wrongly think pipe water dispensers remove minerals and trace elements from water.
There are only two types of filter cores used in kitchen water purifiers for direct drinking: 0.01μm PVC ultrafiltration (UF) membranes and 0.1nm reverse osmosis (RO) membranes.
They determine the properties of the purified water produced.
Other so-called high-tech features attached to filter cores are just marketing buzzwords, their actual impact on water quality is far less than their marketing effect.
When used in kitchen water purifiers, 0.01μm PVC ultrafiltration (UF) membranes can intercept water impurities such as sediment, rust, colloids, bacteria and viruses. They remove nearly all water-insoluble impurities with a removal rate of up to 99.99%, producing mineral-retaining purified water that preserves the natural minerals and trace elements in the water.
If you want to retain the beneficial minerals and trace elements in water, you should choose an ultrafiltration water purifier instead of an RO reverse osmosis one. This is especially true when the raw tap water quality is already excellent. Ultrafiltration does not alter the intrinsic properties of water; it only improves the quality of raw water by removing nothing but water-insoluble particulates, bacteria, viruses and other impurities.
In contrast, RO membranes alter the intrinsic properties of water. With an ultra-high filtration precision of 0.1nm, they not only intercept particulate impurities, bacteria and viruses in water, but also remove all minerals and trace elements, thus changing the nature of water and producing purified water that contains only water molecules. Regardless of the quality of the raw water, the purified water produced by RO membranes is always the same, it will erase all the original characteristics of the raw water.
What’s more, for every glass of purified water an RO reverse osmosis water purifier produces, it generates at least one glass of wastewater, causing significant water waste. Ultrafiltration water purifiers, on the other hand, produce no wastewater at all. Due to RO membrane ultra-high filtration precision, RO membranes are highly prone to clogging. To prevent mineral scaling on the concentrated water side, RO water purifier filter cores are usually added with scale inhibitors to extend their service life.
The netizen also claimed that combining RO-filtered pure water with tap water solves the problem of water nutrient balance, which is also incorrect.
RO membranes filter tap water in the first place, while mixing RO-filtered pure water with raw tap water is essentially recontaminating the filtered purified water.
If you want to retain minerals and trace elements in water, use an ultrafiltration water purifier directly.
If you want to lower the TDS level of raw water, the best solution is to mix RO-filtered pure water with UF-produced mineral-retaining purified water in a specific ratio. This allows you to artificially control the TDS level of the final purified water, preventing it from being overly hard while retaining the natural minerals and trace elements essential to the human body.
Natural minerals and trace elements in water are beneficial to human health. That said, excessive mineral content in water can easily cause scaling.
Unlike artificially added minerals, natural minerals and trace elements in water come in a rich variety and create a 1+1>2 synergistic effect with each other.
In our view, the best water purifier is one that restores water to its original state, not one that alters its intrinsic properties.
This is why the ChengrongEra Mineral-retaining Purified Water Kitchen Water Purifier uses a high-performance composite filter core with only four types of filtration materials—pleated filter cotton, activated carbon fiber, PP cotton, and chlorine-removable UF membrane, which is Chengrong factory's proprietary technoloy—with no additional additives whatsoever.
It removes 99.99% of particulates such as sediment and rust, as well as bacteria, viruses and residual chlorine from water. It purifies water, enhances its taste, but never alters its intrinsic properties—all while retaining the natural minerals and trace elements in the water, producing genuine and healthy mineral-retaining purified water.
Chengrong UF water filter&Purifier, Zero Worries for Customers
Rust-free for 10 years
Leak-free for 10 years
After-sale support for 10 years
ChengrongEra (诚荣时代®）Water water filter&Purifier, never compromise on quality
Based in Shenzhen, Chengrong factory is a Top 3 player in China’s pipeline ultrafiltration water filter industry; it is the only full-supply-chain UF manufacturing plant in the sector, unmatched by any other peer. We are also the ODM/OEM manufacturer for multiple world-leading brands. For customers, Chengrong factory never compromises on quality and service; quality is more insuring than insurance companies; service is more customer-like than the customer.
