In Italy, although municipal tap water is up to standard, many people still choose to drink tap water treated by water purifiers.
However, water purifiers have a problem: they are prone to bacterial growth and sometimes contain pathogenic bacteria.
Health experts in Italy sampled 28 sets of tap water purification equipment from 19 family-run nursing homes in Bologna for investigation.
It was found that the equipment fell into two types: One type is microfiltration water purifiers, with a filtration precision of 0.5 microns, composed of a composite of polyethylene membrane and powdered activated carbon; the other type is RO reverse osmosis water purifiers.
The test results showed that:
A. In terms of total bacterial count, whether it is microfiltration water purifier or reverse osmosis water purifier, the bacterial count at the water outlet is higher than that at the water inlet, especially for RO reverse osmosis water purifiers.
B. In terms of pathogenic bacteria, Pseudomonas aeruginosa was detected at both the water inlet and outlet of both types of water purifiers, especially for microfiltration water purifiers.
C. In terms of physical and chemical indicators, the residual chlorine in the effluent of both types of water purifiers was reduced by half. (To prevent bacterial growth in municipal tap water during transportation and storage, it is necessary to maintain sufficient residual chlorine in the water.)
D. RO reverse osmosis water purifiers will greatly reduce the sodium, calcium, total hardness, TDS value and PH value in the effluent.
The above content is what I read in the book "Drink for Nutrition: Clarifying Doubts About Drinking Water, Minerals and Health", which is the book I have read most frequently in the past year. Because the author of this book, Professor Shu Weiqun, is authoritative enough. She is the only scholar in China who has long been engaged in research on the hygiene and nutrition of drinking water.
As a practitioner in the ultrafiltration water purification industry, I believe her research can provide me with theoretical guidance and help Chengrong Ultrafiltration Factory develop higher-quality UF water filters and purifiers. As chengrong factory has ranked among the TOP 3 in the ultrafiltration water filters and purifiers industry, I would like to use the insights from this book to share some industry knowledge with you.
First, with the development of technology, the PE microfiltration membrane with a filtration precision of only 0.5μm used for under-sink water purifiers for drinking has long been eliminated. Now the mainstream choices on the market are PVC ultrafiltration membranes with a filtration precision of 0.01μm and RO membranes with 0.1nm.
The main difference between the UF and RO water purifiers, is that, ultrafiltration membranes can retain natural minerals and trace elements in water, while RO reverse osmosis membranes will remove minerals in water, producing pure water with a higher wastewater ratio.
As a leading ultrafiltration factory, I do not recommend using 0.1μm PVDF microfiltration membranes for under-sink end-use water purifiers, because their filtration precision is too low for drinking. They are more suitable for whole-house water purification, clarifying turbid well water and rural yellow muddy water.
Second, why is the total bacterial count at the outlet of microfiltration water purifiers and RO reverse osmosis water purifiers higher than that at the inlet?
Because in the water purifiers industry, there is a default structural design: we usually place an activated carbon filter element behind the microfiltration membrane and RO membrane to improve the taste of water. It is this post-positioned activated carbon filter element that causes the common problem of bacterial exceeding standards in water purifiers.
Post-positioned activated carbon is porous, moist and rich in organic matter, which is simply a paradise for bacterial reproduction. Since pure water produced from the RO membrane has no bacteriostatic ability.Therefore, when tap water is filtered by the RO membrane into pure water containing nothing, it will instantly exceed the bacterial standard when passing through the activated carbon filter element to improve the plain taste.
Many consumers like to use TDS pens to judge the quality of water, but do you know?
TDS pens cannot detect the bacterial content in water because bacteria are non-conductive.
As a high-end water purifier brand, ChengrongEra boasts top 1% quality in the industry and targets the top 2% of end-users who are not price-sensitive but demand exceptional quality. So, how exactly does our mineral-retaining under-sink water purifier address the common issue of bacterial overgrowth in water purifiers?
We have made Three innovations:
A. Abandon the granular carbon filter elements commonly used in the water purifier industry, and adopt activated carbon fiber filter elements with higher costs and quaility.
Although activated carbon fiber comes at a higher cost, it offers superior adsorption efficiency for taste-impacting impurities such as odors and residual chlorine, a longer service life, and a noticeable improvement in water taste. More importantly, compared to ordinary granular carbon, it is less likely to trap dirt and foster bacterial growth.
B. In both RO and ultrafiltration water purifiers, the industry commonly adds post-positioned activated carbon after the water ffiltration membrane, it not only enhances water taste but also extends the activated carbon’s service life.
However, the structural design of ChengrongEra’s mineral-retaining under-sink water purifier breaks this industry tradition:
We place the activated carbon upfront, first improving the water taste, then passing the water through a residual chlorine-removable ultrafiltration membrane. Instead of using activated carbon, we adopt the residual chlorine-removable ultrafiltration membrane as the final barrier, which intercepts 99.99% of sediment particles, bacteria, viruses, residual chlorine, and other impurities, ensuring the produced mineral-retaining clean water remains free from recontamination.
Ultrafiltration membranes are versatile, suitable for both Under-sink end-use water purification and whole-house water purification. For end-use drinking water, we use Chengrong’s self-developed residual chlorine-removable ultrafiltration membrane; however, for whole-house water filtration, we still recommend customers retain residual chlorine in the water to inhibit bacterial growth.
C. ChengrongEra mineral-retaining under-sink water purifier adopt a dual-water outlet design.
Mineral-retaining clean water is used for drinking, cooking, boiling soup, etc.
Vegetable washing water is used for dishwashing, vegetable washing, table wiping, etc.
However, the structural design of ChengrongEra’s mineral-retaining kitchen under-sink water purifier breaks this industry tradition: we place the activated carbon upfront, first improving the water taste, then passing the water through a residual chlorine-removable ultrafiltration membrane.
Rather than using activated carbon, we use the residual chlorine-removable ultrafiltration membrane as the final barrier, which intercepts 99.99% of sediment particles, bacteria, viruses, residual chlorine, and other impurities, ensuring the produced mineral-retaining clean water remains free from recontamination.
Third, minerals in drinking water are a long-term fixed source of calcium, magnesium and other trace elements for the human body, and the minerals in water are more easily absorbed by the human body than those in food.That’s why ChengrongEra’s mineral-retaining water purifiers are designed to preserve the natural minerals and trace elements in water.
Mineral-retaining water is not only clean, but also healthy.
As for the problem of water scale, in fact, the scenario most affected is not drinking, but equipment that uses water for a long time and heats water, such as water heaters, washing machines, toilets and showers.When it comes to drinking water, I prefer retaining its natural minerals and trace elements rather than removing them first and then adding them artificially, as pure water machines do.
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 filters and 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.
