HYDAC filter cartridge sold by Hedec in Germany

HYDAC filter cartridge sold by Hedec in Germany

At first glance at the material of the filter element

The main filtering material for air filters is filter paper. Nowadays, filter paper is mainly made of domestic and imported paper. Both domestic and imported paper have good filtering performance. However, the inferior filter paper used for fake filters cannot prevent dust from entering the engine, thereby affecting its normal operation. The filter paper color of ordinary genuine filter cartridges is uniform, and the paper surface is relatively flat; However, inferior filter cartridges have inconsistent colors, hairy paper surfaces, and poor texture.

Take a second look at the gum of the filter element

Nowadays, the structure of filter cartridges is generally composed of filter paper and rubber bonded together, and the gel of genuine and fake filter cartridges is also different. The rubber texture of the genuine filter element is good and elastic, while the rubber of the fake filter element is soft and of poor quality. A relatively easy way to distinguish is to fold the air filter in half. After loosening, the genuine filter quickly returns to its original state, while the fake filter has poor adhesion with the filter paper due to rubber texture issues, and the middle mark of the fold is obvious.

In addition, some labels can be used, such as imported ones with line patterns, and of course, some domestic ones can also be imitated, but careful observation will make a difference.

Everyone knows that the first stage used in water purifiers is the PP filter element, also known as melt blown PP, made of polypropylene (PP material). Its main function is to filter various harmful impurities, organic pollutants, minerals, and other impurities with a diameter greater than 1 micron in tap water. Since it does not have a drainage function, its service life is generally 3-6 months. Therefore, it is necessary to regularly replace the filter element, otherwise it will cause secondary pollution problems and the water quality cannot be guaranteed. According to the usage range, it can be divided into 10 inches to 40 inches, and can be customized according to special requirements such as density, length, and weight. First, let's look at the density. PP can be divided into 1um and 5um based on the difference in pore size. Then, the weight is also around 100g and 110g. The pore size cannot be recognized by the naked eye, but the weight and tactile sensation can be distinguished by hand. The quality of the filter element directly affects the quality and filtration effect of the water purifier, so commonly used 1 micron and 5 microns are generally used, with the heavier one being the best choice. At the same time, because PP cotton filter cartridges are usually used in the first three stages, they must be replaced regularly, otherwise it will have an impact on the service life of the RO membrane and the TDS value of the effluent water quality.

Is the PP cotton filter harder or softer? In fact, a high density and sturdy grip indicate high compressibility, longer filtration accuracy and service life. However, soft PP may scatter after high water pressure or prolonged use, causing a decrease in filtration and affecting the normal operation of the RO machine. Therefore, PP, which has advantages in both quality and price, is necessary to fundamentally improve the quality of the entire water purifier.

service life

The service life of the filter element will also vary depending on the raw materials used. As the usage time prolongs, impurities in the water will clog the filter element, and the activated carbon filter element will become saturated with adsorption. So, generally speaking, PP filter cartridges need to be replaced after 3 months, while activated carbon filter cartridges need to be replaced after 6 months. Hollow fibers, due to their inability to be cleaned, are usually placed at the back end of PP cotton and activated carbon for use, otherwise they are more prone to clogging. If used as end sterilization equipment for water purification, they need to be replaced after 1-2 years. Ceramic filter cartridges can generally be used for 10-12 months, and good ceramic filter cartridges can be used for 3-5 years or even longer.

Replace signal

1. Slow water production: Is the pre filter element or reverse osmosis membrane clogged; 2. Producing water too quickly (filling a bucket in less than an hour): The reverse osmosis membrane is damaged; 3. Poor taste: The lifespan of the rear activated carbon filter has expired; RO membrane removal rate less than 75%: The lifespan of the reverse osmosis membrane has expired.

The calculation formula for membrane removal rate is: RO membrane removal rate=(TDS value of raw water - TDS value of pure water) * 100%/TDS value of raw water

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