Johnson type Assembled Nozzle


Assembled nozzle for false bottom filter

Lower mouth with 2″ mouth, in stainless steel 316, for high flow rates to be placed on plate or false bottom filters.

Product images are demonstrative and may vary from the physical product.


2″ Johnson type nozzle for false bottom filters

Nozzle type Johnson brand: Carbotecnia

Made of 316L polished stainless steel.

Connection: 2″ bottom opening

Microslot opening of the external part: 0.18 mm

Lower rubber packing.

It includes a foot valve to prevent the return of water. (can be removed if not needed)

Nozzle dimensions:

  • Diameter: 82 mm
  • Slotted part height: 50 mm
  • Lower opening: 50 mm
  • Total height: 150 mm


Johnson microgrooved nozzles are used for the retention of granular media in water treatment equipment. These media can be of any type, such as: activated carbon, silica sand, ion exchange resins, green sand, MTM, Birm, pyrolusite, among others.

In addition to the retention function, the micro-slotted nozzles provide good drainage and adequate flow distribution, both in equipment working under pressure and in those working by gravity.

The Johnson type element through which the fluid flows, has a “V” shaped cut, with the most closed part towards the outside of the nozzle. This design prevents clogging.

The microslot is continuous and has a total flow area of approximately twice the cross-sectional area of the connection nipple. This means that the microslot does not constitute a restriction to flow and, therefore, causes minimal pressure drop.

The 0.18 mm opening in the most closed part, which is in contact with the granular medium, allows any granules larger than 40 mesh to be retained directly. This means that no gravel beds are required for support.

Learn more nozzles here:

What is a Nozzle and how does it work?

Selection of a distributor or nozzle for a deep bed filter