3 Knowledge about each water purifier that you must know

1.2    Nanofiltration membrane (NF)

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Nanofiltration (Nanofiltration) is a membrane separation technology between ultrafiltration and reverse osmosis.

Its molecular weight cut-off is in the range of 80- and the pore size is 1 nanometer, so it is called nanofiltration.

Nanofiltration technology is a membrane separation technology separated from RO technology, and is the continuation and development branch of ultra-low pressure RO technology.

For a long time in the past, nanofiltration membranes have been called ultra-low pressure reverse osmosis membranes (LPRO: Low Pressure Reverse Osmosis).

Now, nanofiltration technology has been separated from reverse osmosis technology and has become an intermediate between ultrafiltration and reverse osmosis.

The independent separation technology between technologies has been widely used in drinking water preparation, medical water preparation, food industry, environmental protection and many other fields, and has become an important branch of membrane separation technology.

Principle: Like the separation process of ultrafiltration and reverse osmosis membranes, nanofiltration membranes are also membrane separation processes driven by pressure difference, which is an irreversible process.

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The separation mechanism can be described using charge models (space charge model and fixed charge model), pore model, and electrostatic repulsion and three-dimensional obstruction models that have only been proposed in recent years.

Step 3: Consider how the filter fits your home, lifestyle, and budget.

Many different types of filters are available to consumers. Determining which type is most appropriate for you&#;or whether you need a filter at all&#;depends on what functions you want a filter to provide. No filter eliminates all contaminants, so understanding what filters do and do not do is important.

What does the filter remove?

Read the label to see if it is NSF-certified.  If it is, you can search NSF&#;s database to learn more about what a particular model is certified to protect you against. Labels on water filters also typically state the contaminants that are reduced, which can help to guide your choice. Be sure to read labels carefully yourself and verify the manufacturer&#;s claims with an independent source, as not all sales representatives will be familiar with your needs.

Keep in mind that most brands include many different types of filters. Sales people might be able to help you make an appropriate selection, but remember that they are sometimes paid to sell a particular brand. You should check claims and read the fine print on filter packaging for yourself and ensure that it will work for your purposes before purchasing.

Don&#;t assume that if the filter removes one contaminant, it also removes others. Filters that remove chemicals often do not effectively remove germs, and vice versa. Some water treatment devices that remove chemicals, such as reverse osmosis, ion exchange, or distillation systems, might also remove fluoride. Children who drink water with levels of fluoride <0.6 ppm might need a fluoride supplement. Check with your child&#;s pediatrician or dentist for specific recommendations.

How much does the system cost?

The prices of different filtration systems can vary widely, from simple systems that can cost under $20 to complex systems costing hundreds of dollars and requiring professional installation. In addition to the price of purchasing and installing the system, consider the cost, schedule, and ease of maintenance, such as changing filter cartridges. In order to continue to work properly, all water treatment systems require maintenance.

How much filtered water do you need?

Some filters are slow, while others can filter large amounts of water quickly. If you only need the filter for personal drinking water, you may not need a fast filter.

What kind of system do you need, and how does it fit into your home?

Filters commonly found in homes and stores include water filter pitchers, end-of-tap or faucet-mounted filters, faucet-integrated (built-in) filters, on-counter filters, under-sink filters, and whole-house treatment units. No filters or treatment systems are 100% effective in removing all contaminants from water, and you need to know what you want your filter to do before you go shopping (see Step 1). Not all filters of a particular type use the same technology, so you should read the label carefully.

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