Pressure vertical and horizontal filters are devices which slotted drainage pipe are mostly used. Sometimes they are use in open filters also. They are very useful in water treatment or other cleaning liquids and gases. In these filters, pipe drainage works as distributors or collectors of filtered and regenerative media. Offered by us slotted drainage pipe are designed and manufactured to customers order, so we can adapt them to any tank. NILTECH drainage slot can be made with slot gap (from 0.025 mm), which is a perfect adjustment of the level of filtration and drainage efficiency. Drainages can be made of Acid-resistant steels: AISI 304, AISI 316 L, Hastelloy, Monel, Uranus. Drainage slot tube is an alternative to the slotted nozzle and a flat slotted drainage filtration. The type of drainage used depends on the selected drainage technology and construction of the filter tank.