Stainless steel does not mean “steel that never rusts.” Instead, it means steel with much higher resistance to corrosion.
The reason why 304 stainless steel resists rust is that elements such as chromium and nickel are added to the steel. These elements would react with oxygen in the air to form a thin, dense, and stable protective layer, which isolates the iron inside the steel from air and moisture.
As a result, 304 stainless steel is more resistant to acids, alkalis, and corrosion than ordinary steel, while also offering better long-term durability.
Why 304 Stainless Steel Quality Matters in Whole House Residential Filtration Systems
Whole house water filtration systems require long-term contact with water.
However, water conditions, including pH levels, residual chlorine, dissolved substances, and sediment, would affect the stability of the protective layer on stainless steel over time.
Therefore, the stability of this protective layer is critical for maintaining corrosion resistance, reducing risks such as rust and leakage, and ensuring the long-term reliability of the whole house residential filtration system.
During long-term operation, stainless steel housing of the whole house residential filtration system are continuously exposed to different water conditions. If the protective layer becomes unstable or damaged, corrosion may occur, creating risks such as rust, leakage, and potential material leaching into the water.
Therefore, for whole house residential filtration systems, the quality of the stainless steel material itself are extremely important.
However, for ChengrongTimes, genuine 304 stainless steel is only the foundation. We go beyond this standard by upgrading our whole house residential filtration systems with 316L stainless steel.
Compared with 304 stainless steel, 316L stainless steel contains molybdenum (Mo), which provides improved resistance against chloride corrosion and more demanding water environments.
Why 304 Stainless Steel Quality Has Become a Challenge for the Whole House Residential Filtration system
Nickel is an important alloying element in 304 stainless steel, especially for stainless steel housings used in whole house residential filtration systems.
However, nickel is also a relatively expensive alloying element.
Nowadays, price competition has become increasingly intense across many industries. As some customers focus mainly on initial cost, certain manufacturers reduce nickel content and use lower-grade stainless steel materials while marketing them as standard 304 stainless steel.
This can reduce corrosion resistance and increase the risk of premature rusting due to insufficient alloy composition.
For whole house residential filtration system products with stainless steel housing, like the ultrafiltration water filter manufactured which we manufactured, this creates potential risks.
A stainless steel housing used in a whole house residential filtration system is not just a simple metal component. It is a critical part of a whole house residential filtration system, where the filtered water may be used for drinking, cooking, washing vegetables, brushing teeth, and daily bathing.
This is why Chengrong Ultrafiltration Factory insists on using genuine sanitary-grade 304 stainless steel sheets and housing, instead of lower-grade materials with reduced alloy composition.
Poor-quality 304 stainless steel not only increases the risk of corrosion and leakage but may also create potential concerns regarding water safety.
Genuine 304 Stainless Steel Housing: The Basic Quality Commitment at Chengrong Ultrafiltration Factory
Since its establishment in 2008, Chengrong Ultrafiltration Factory has maintained long-term cooperation with the same major stainless steel material supplier for more than 15 years.
We believe that trust, integrity, and shared growth are the foundation of a reliable supply chain. Through stable partnerships, we ensure consistent quality and supply stability for the 304 stainless steel tubes and sheets used in our filtration systems.
All stainless steel tubes and sheets used in our factory are sanitary-grade 304 stainless steel materials.
Every incoming batch is verified through supplier material certificates and sampling inspections according to ASTM A240/A240M-2024 requirements before entering production, ensuring that the materials meet applicable stainless steel standards and Chengrong Times’ internal quality requirements.
Our material inspection procedures include salt spray testing, hardness testing, surface finish inspection, roundness measurement, and tensile testing. These requirements go beyond basic industry practices because ChengrongTimes never compromises on material quality or accepts suppliers who fail to meet our standards.
Why ChengrongTimes Upgrades from 304 to 316L Stainless Steel for Whole House Filtration Systems？
With 19 years of experience in stainless steel ultrafiltration water filter manufacturing, Chengrong Ultrafiltration Factory has become a trusted OEM/ODM partner for leading water purification brands worldwide. Over the years, five leading global water purification brands have selected Chengrong Factory as their manufacturing partner for ultrafiltration products.
However, we have also witnessed increasing price-driven competition across the ultrafiltration water filtration industry. When the market focuses excessively on reducing costs, product quality and long-term reliability can be compromised.
Thus, ChengrongTimes was founded in mid-2025 with a clear purpose: to bring our manufacturing experience directly to end users through our own whole house residential filtration brand, focusing on advanced ultrafiltration technology, higher quality standards and peace-of-mind customer service.
For a manufacturer building its own brand, the only sustainable path is to create exceptional value by combining reliable performance and durable quality.
While some manufacturers reduce material standards to lower costs, ChengrongTimes chooses the opposite path.
We upgraded our stainless steel materials from 304 to 316L, pursuing a higher standard of corrosion resistance, durability, and long-term reliability. Our goal is to bring our whole house water filters to the same material standards expected by leading global brands.
Our vision is to create whole house residential filtration systems that set a benchmark for global manufacturers.
This is not just a vision.
It is the standard we are building every day.
Why Customers Choose Chengrong Times Whole House Water Filtration Systems
Ultrafiltration water filter made in Chengrong Factory, Built for Long-Term Reliability, Peace of Mind for Customers Worldwide
10-Year Corrosion Resistance Commitment
10-Year Leak Protection Commitment
10 Years of After-Sales Support
ChengrongTimes Whole House Water Filtration Systems, Never Compromise on Quality and Service
Written by:
Beikan Zhuang
Founder of Chengrong Ultrafiltration Factory and ChengrongTimes.
Starting from a small metal fabrication workshop with fewer than 10 employees, the founder of Chengrong Factory has spent nearly 20 years building Chengrong Factory from a small manufacturing business into a leading manufacturer specializing in stainless steel filter housings, ultrafiltration membrane technology, and whole house ultrafiltration water filtration systems.
With extensive experience in stainless steel housing fabrication, ultrafiltration membrane technology, and water filtration system development, he has helped global partners improve product competitiveness.
Jinlu Liu (Claire Liu)
International Business Manager at ChengrongTimes, helping global partners develop reliable whole house filtration solutions.
Frequently Asked Questions
Why does Chengrong Times choose 316L stainless steel instead of 304 stainless steel?
ChengrongTimes chooses 316L stainless steel housing because it provides improved corrosion resistance, making it more suitable for long-term water contact applications than our peers.
What filtration technology does ChengrongTimes use?
Chengrong Times uses ultrafiltration membrane technology in our whole house residential filtration systems, including 0.1-micron PVDF membranes and 0.01-micron PVC membranes.
These filtration technologies effectively remove fine sediment, colloids, and other suspended impurities from water, helping deliver crystal-clear water from every tap throughout the home.
By reducing impurities that may affect household water equipment, our whole house ultrafiltration systems help improve water quality and extend the service life of water-related appliances.
Is ChengrongTimes a manufacturer or a trading company?
ChengrongTimes is a factory-owned brand launched by Chengrong Ultrafiltration Factory in mid-2025.
We are a real manufacturer with integrated capabilities covering stainless steel housing fabrication, ultrafiltration membrane development, production, assembly, and testing.
Unlike simple assembly factory that rely mainly on external suppliers, Chengrong Ultrafiltration Factory controls key manufacturing processes internally. Our expertise combines stainless steel fabrication capability with water purification system development, allowing us to understand both the hardware structure and ultrafiltration filtration technology behind whole house residential filtration systems.
This integrated manufacturing capability has enabled us to become an OEM/ODM partner for five leading water purification brands. By working directly with a manufacturer that controls materials, technology, and production processes, our partners can achieve better product differentiation, stronger quality control, and improved market competitiveness.