A homeowner recently posted a question online:
I’m renovating my new home and planning to install an under sink water filter in the kitchen.
However, I’m confused by the different filtration technologies available. The tap water in my area is relatively hard, so how should I choose the right water filter and avoid common mistakes?
Which is better under sink water filter—RO or ultrafiltration?
One commenter replied:
There is no need to install a RO under sink water filter, because it would remove beneficial minerals from the water. Drinking demineralized water over a long period may lead to an insufficient mineral intake.
I recommend ChengrongTimes mineral-retaining under sinke water filter because it is a leading source manufacturer in China specializing in ultrafiltration water filters for 19 years.
The mineral-retaining under sink water filter from ChengrongTimes could offer greater reliability and quality assurance than other brands.
Why a Mineral-Retaining Under Sink Water Filter Is Better for Your Family Than an RO System
RO under sink water filter is highly effective at reducing dissolved salts and a wide range of contaminants, but this high level of filtration comes with trade-offs.
| Comparison | RO Water Filter | ChengrongTimes Mineral-Retaining Filter |
|---|---|---|
| Natural minerals | Removes all the minerals | Retains naturally occurring minerals |
| Wastewater | Generates reject water | No drain-connected reject-water discharge |
| Hardness reduction | Yes | No significant reduction |
| Safe for Direct drinking | Yes | Yes |
| Best suited for | High TDS or dissolved contaminants | Already-safe municipal or tested well water |
1) RO Under Sink Water Filter Would Generate A Significant Amount of Wastewater, While ChengrongTimes Mineral-retaining Water Filter Achieves zero Wastewater Discharge
According to the U.S. Environmental Protection Agency, a typical RO under sink water filter sends five gallons or more of water down the drain for every gallon of treated water it produces.
In contrast, the ChengrongTimes mineral-retaining under-sink water filter does not produce a separate reject-water stream. Its dual-outlet faucet design ensures that all treated water can be put to practical use.
Water from the 3-stage filtered water outlet can be used for washing dishes and vegetables, wiping tables and other household cleaning tasks. Each time this outlet is used, the flowing water also provides a forward-flushing effect for ChengrongTimes proprietary chlorine-removal ultrafiltration membranes, helping to reduce membrane fouling and extend the filter’s service life. Since this water has already passed through the first three filtration stages of the composite filter cartridge, it is cleaner than untreated tap water.
Compared with RO under sink water filter, which can generate a large amount of wastewater, ChengrongTimes mineral-retaining under sink water filter achieves zero wastewater discharge. Its dual-outlet faucet design also eliminates the need to connect the under sink water filter to a drainpipe, minimizing the risk of bacterial growth and potential contamination from the drainage system.
2) RO Under Sink Water Filters Remove Natural Minerals, While ChengrongTimes Mineral-retaining Water Filter Retains All of Them
The filtered water from RO under sink water filter is undoubtedly clean.
However, for everyday drinking, the RO under sink water filter also removes most of the naturally occurring minerals and trace elements from the water.
When municipal tap water is already safe and meets drinking-water standards, such intensive demineralization may be unnecessary, making RO under sink water filter a less suitable choice than ChengrongTimes mineral-retaining water filter for daily household drinking water.
A chapter in the World Health Organization’s 2005 publication, Nutrients in Drinking-water, noted that demineralized or very low-mineral water that has not been remineralized is not considered ideal for regular consumption, as it may provide insufficient amounts of certain beneficial minerals.
In contrast, the ChengrongTimes mineral-retaining under sink water filter uses a 4-stage composite filter cartridge consisting of a pleated sediment filter, activated carbon fiber, PP cotton and a proprietary 0.01-micron chlorine-reduction ultrafiltration membrane.
This system effectively reduces sediment, rust, residual chlorine, bacteria, viruses and other common contaminants, while preserving the naturally occurring minerals and trace elements in the water.
The resulting water allows families to obtain naturally occurring minerals through their daily drinking water, while avoiding the risk for post-treatment remineralization or artificially added minerals.
4-stage composite filter cartridge consisting of a pleated sediment filter, activated carbon fiber, PP cotton and a proprietary 0.01-micron chlorine-reduction ultrafiltration membrane
3) Like RO Under Sink Water Filter System, ChengrongTimes Mineral-retaining Water Filter Also Delivers Direct-Drinking Water
A common misconception about ultrafiltration membranes and ultrafiltration water filters is that they cannot produce water that meets direct-drinking standards.
However, ChengrongTimes mineral-retaining under sink water filter challenges the common misconception that ultrafiltration water filter cannot produce water that meets direct-drinking standards.
A test report issued by the Shenzhen Institute of Metrology and Quality Inspection confirms that water produced by the ChengrongTimes mineral-retaining under sink water filter passed all 31 tested direct-drinking water quality parameters, demonstrating that it meets the applicable direct-drinking water standards, just as water produced by an RO under sink water filter system does.
Achieving this level of filtration with an ultrafiltration-based system is a rare accomplishment in the industry. It is made possible by ChengrongTimes proprietary chlorine-removal ultrafiltration membrane technology.
Unlike RO systems, however, ChengrongTimes does not excessively demineralize the water. It removes common contaminants while preserving the naturally occurring minerals and trace elements, producing water that is both clean and healthy.
Conclusion
When the source water is already safe, such as treated municipal tap water or well water confirmed to be safe through professional testing, ChengrongTimes would be better than RO under sink water filter.
Because ChengrongTimes under sink water filter could remove what is harmful while preserving the naturally beneficial minerals in water, which is hard to find the second in the world.
Ultrafiltration water filter made in Chengrong Factory, Built for Long-Term Reliability, Peace of Mind for Customers Worldwide
10-Year Rust-Free Guarantee
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10 Years of After-Sales Support
ChengrongTimes Whole House Water Filtration Systems, Never Compromise on Quality and Service
FAQ:
When Is an RO System a Better Choice Than a ChengrongTimes Mineral-Retaining Under Sink Water Filter？
When the source water is seriously contaminated—for example, when nitrite, fluoride or certain dissolved heavy metals exceed safe limits—and switching to a safer water source is not possible, an RO under sink water filter system may be a more suitable choice than a ChengrongTimes mineral-retaining water filter.
RO under sink water filter may also be more appropriate for extremely hard water with TDS>300, when a significant reduction in calcium and magnesium is required.
ChengrongTimes is more suitable for improving already-safe water with TDS<300, without unnecessary demineralization.
ChengrongTimes is a source manufacturer specializing in ultrafiltration water purification systems. With more than a decade of membrane research and manufacturing experience, our factory provides product development, OEM and ODM services for global customers.
