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Two major advances in string wound sediment filter

Pleated sediment filter

String wound sediment filter cartridges were first introduced in the market in the 30s. The string wound sediment filter was made from cotton yarn which was wound into string. The crossings of the yarn create diamond patterns that are close together. Water filtration occurs at the crossings of the yarns or in the diamond patterns. The string wound sediment filter cartridges filters the water and reduce the chemicals in the water. They also reduce the contaminants that may be present in the water. Over the years the string wound sediment filter has undergone several changes to improve its filtration capabilities. Here are the two major advances in string wound sediment filter that are in the market today.

First, in the 60s through the 70s the cotton yarn of the string wound sediment filter was replaced by other synthetic materials, such as the polypropylene core. They became more popular because they allowed for more filtering capabilities. Moreover, they prevent the growth of microorganisms. They are also chemical resistant. The yarn was replaced by what is known as the roving. The roving are strands of fibers that are similarly twisted like the cotton. The rovings are cheaper and last longer as more water can pass through them easily. The roving however was eventually replaced by the friction spun yarns. They are the improved version of the roving, as they are even cheaper and last even longer. Although they are great for filtering, both the roving and the friction spun yarns have the problem of tunneling and media migration. These led to the development of the melt down cartridge. They overcome the problems of media migration and tunneling. They are the string wound sediment filter that we use today. In most homes today, this is what is used in home filter systems.

Second is advances in string wound sediment filter used in well water. Sediment filter for well water or well water sediment filters are heavy duty filters. This is because well water contains sediments. This may be dirt and sand and other sediment depending on where the well water is located. For well water, the heavy duty string wound sediment filters with higher microns were developed. Basically you have the regular string wound sediment filter, the polypropylene and the pleated sediment filter. For well water, the polypropylene filters are used. On the outside, they have higher micron rating. In the inside or the core, the micron rating is lower. With such variation in micron rating, they are very effective in removing the dirt in well water. They are also very effective in turbidity and addresses water discoloration. Aside from well water, they are also used in other water sources that are not as clean and clear as the water supplied in our homes.

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