multi-type of cartridge filters

Cartridge Filter Application in process

Why using cartridge filter in your system?

Safety filters, which are also called cartridge filters, are generally installed in front of RO systems in membrane water treatment. The cut-off size of safety-filter cartridges is often smaller than 10 microns. The most common cutoff size of safety-filter cartridges is 5 microns.

Many end-users think that it is unnecessary to place safety filters after an UF stage because their nominal pore size is significantly higher than that of UF membranes, which is between 0.01 and 0.1 microns. Operational results of many plants, however, indicate that safety filters can not only remove the suspended solids and colloids remaining in the RO feed water, but also prevent entry of broken UF membrane threads and debris from a previous storage tank into the RO system.

Moreover, although UF can remove most pathogens with large molecular weights, such as viruses, debris, colloids and organic media, small microorganisms will dramatically harm RO membranes because of their geometric series propagation. Hence safety filters are indispensable for the safe operation of RO systems.

In practice, the presence of a safety filter transfers most of the microorganisms’ influence on RO membranes to itself to some degree, which means that cheaper filter cartridges are used to protect more expensive and complicated RO membranes. This method has been recognized and adopted by end-users and contractors in more and more water treatment projects.

Safety filters effectively protect RO membranes from biological pollution and scaling. In addition, they prevent apparent salt leakage caused by punctures from some particles impelled by the high-pressure pump and protect the high-pressure pump’s impeller from scuffing, which ensures safer and more reliable operation of the RO membrane and its subsequent facilities.

Filter cartridges can be divided into pleated, melt-blown and thread winding types.