What is “3-Free” direct filtration technology?

Release time:

2026-04-11

During the water production (filtration) process, no external power equipment such as pumps is required to generate pressure. The process typically relies on the inherent potential energy of the wastewater—such as the water level difference or gravity—or on the osmotic pressure generated within the system as the driving force. Implementation: In ASSFBR, this is achieved through the use of a liquid-level difference.

Technical Analysis—What Is “3-Free Direct Filtration Technology”?

1. Power-free water production

· Definition: During the water production (filtration) process, no external power equipment such as pumps is required to generate pressure. Instead, the process typically relies on the inherent potential energy of the wastewater—such as the water level difference or gravity—or on the osmotic pressure generated within the system itself as the driving force.

· Implementation method: ASSFBR is achieved through a liquid level difference.

2. No consumable replacements (no secondary pollution)

· Meaning: The system’s core filtration unit is not a conventional “consumable” in the traditional sense; it features self-cleaning, anti-fouling properties, and long-term stable operation, eliminating the need for frequent replacements throughout its service life—unlike PP cotton or activated carbon.

· Implementation method: Achieved through specialized material and process design (such as backwashing). In addition, the internal filter media in the cartridge experiences an annual attrition rate of approximately 1%, requiring replenishment every 2–3 years to ensure long-term performance.

3. Non-discriminatory Inflow

· Meaning: This is one of the technology’s most core advantages. It refers to the system’s exceptionally high tolerance for influent water quality, enabling it to handle wastewater with complex and highly variable compositions, high levels of suspended solids, high colloidal content, or high oil and grease concentrations—without the need for elaborate pretreatment.

· Implementation approach: Relying on its unique flow-path design, robust anti-fouling performance, and efficient physical/chemical cleaning mechanisms, it can directly handle harsh water-quality conditions.

In summary, “3-Free direct filtration technology” is an advanced filtration technique designed to achieve ultra-simplified operations and maintenance, ultra-low energy consumption, and exceptional adaptability.

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