Household Nanofiltration (NF) Membrane 75GPD

In everyday drinking water, people seek not only safety but also convenience and reliability. The SLW-1812-75-N household nanofiltration (NF) membrane has been designed precisely to meet these needs. Its standard 1812 size ensures easy compatibility with most home water purifiers. Compact in form, it is nevertheless capable of producing a consistent 280 litres of pure water per day.

What does this mean for a typical household? A family of three to five can effortlessly enjoy clean water for morning tea, coffee, cooking, and direct consumption throughout the day. For drinking purposes alone, it can even provide sufficient water for up to eight to ten people. Each drop passes through its high-efficiency membrane layers, removing impurities and heavy metals, while retaining a fresh, natural taste and ensuring healthy, safe water.

The SLW-1812-75-N is designed not only with purity in mind but also convenience. It operates reliably under standard tap water pressure, requires minimal maintenance, and offers a long service life. Choosing this membrane is a choice to provide your family with peace of mind every day, ensuring a constant supply of safe, high-quality water and supporting a healthy, modern lifestyle.

Household NF membranes effectively remove organic matter, residual chlorine, heavy metals, bacteria, and most divalent and multivalent ions from water. They can selectively retain certain monovalent ions, such as sodium and potassium, enhancing both the taste and nutritional value of drinking water.

• Operates at a typical pressure of 3–6 bar, making it more energy-efficient than RO membranes.
• Optimised membrane materials and structure ensure long-term, stable water production.

Household membranes are typically designated by their standard size codes, such as 1812, 3012, etc. The dimensions include:

Outer Diameter (OD): The external width of the membrane element.

Length: The total length of the membrane element.

Connection Type / Port Size: The interface for installation in household water purifiers.

Pore Size Range:

• Nanofiltration membranes typically have pores ranging from 1 to 2 nanometres, positioned between ultrafiltration membranes (0.01–0.1 μm) and reverse osmosis membranes (approximately 0.1 nm).

Separation Mechanisms:

• Sieving Effect: Large molecules, such as organic compounds and colloids, are physically intercepted by the membrane pores.
• Charge Effect: The membrane surface is usually negatively charged, which electrostatically repels divalent and multivalent ions (e.g., calcium, magnesium, sulfate), while allowing partial passage of monovalent ions (e.g., sodium, potassium).
• Solution-Diffusion Theory: Small molecules dissolve at the membrane surface and then diffuse through the membrane layer.

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