Cartridge filter - Bag filter
A Bag filter works by the principle of micro filtration. The liquid is purified in bags by passing small permeable pores. Bag filters can be used for large amounts of water.
The sizes of these pores are between the 1-200 micron
The capacity depends on the surface area from the bags. Bigger systems can clean up to more than 500 m3 /h (multi bag filters)
-There are special bags for various chemicals
-The choice of cartridge filter depends on the application. Cartridge filters are preferable for systems with contaminations lower than 100 ppm, that is to say with contamination levels lower than 0.01% in weight.
Cartridge filter can be surface or depth-type filter: depth-type filters capture particles and contaminant through the total thickness of the medium, while in surface filters (that are usually made of thin materials like papers, woven wire, cloths) particles are blocked on the surface of the filter.
Surface filters are best if you are filtering sediment of similar-sized particles. If all particles are i.e. five micron, a pleated 5-micron filter works best because it has more surface area than other filters. Compared with pleated surface filters, depth filters have a limited surface area, but they have the advantage of depth.
It can be generally stated that if the size of filter surface is increased, higher flows are possible, the filter last longer, and the dirt holding capacity increases. Cartridge filters are normally designed disposable.