Johnson ABS 3/4 NPT Hydrosphere

Jonhson ABS hydrosphere lower diffuser with 3/4 ″ thread, for 3.5 GPM flow 0.18 mm slot opening

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

Made of ABS plastic or also in Kinar (PVDF) on request.

Connection: 3/4 ″ NPT nipple

External micro-groove opening: 0.18 mm


Diameter: 2.9 ″ (74 mm)

Overall height: 3.5 ″ (89 cm)

Maximum Suggested Service Flow: 3-5 GPM (11-18 LPM)

Suggested Maximum Backwash Flow: 6.5 GPM (25 LPM)

Installation distance between each nozzle:

Optimal: 12 cm

Maximum: 30 cm

Suggestion of the number of nozzles depending on the diameter of the pipes.

Pipe diameter

Of nozzles

3/4 ″




1 1/2 ″










Microslotted hydrospheres 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-slot nozzles perform a good drainage, as well as an adequate distribution of the flow, both in equipment that works under pressure, as in those that do it by gravity.

The micro groove through which the fluid circulates has a “V” shaped cut, with the most closed part towards the outside of the nozzle. This design prevents plugging.

The micro groove is continuous and has a total flow area approximately twice the section area of the connection nipple which is nominal ”NPT diameter. This means that the micro groove is not a restriction to flow and therefore causes minimal pressure drop.

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

Hydrospheres are a type of nozzle used for solid / liquid separation of granular filter media and the liquid to be filtered or treated. The nozzles also allow more efficient use of the treatment media. Common applications include:

• Manifolds and distributors installed uniformly through a plate or side arrangement

• Demineralizers, water softeners and pressure or gravity sand filters.


• Economical design

• Unobstructed design

• Large open area

• Greater resistance to corrosion


• Standard diameter: 50 mm

• Typical slot opening 0.2mm to 0.5mm

• Threaded end adapters or “l” bolts

• Made mainly ABS; however, special Kynar® spherical nozzles are also available.

Hydrosphere or nozzle for water filters

Data sheet

to download


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