Transfer of oxygen from air to water better

Fi air diffuser is specially designed, two Nano-Tube lines are parallel and ventilate,the air enters easily,
generating pressure is large enough to cause the bubbles to form more, evenly throughout the tube.

  • Easy to customize

    The Fi air diffuser makes an extremely easy customization installing, accordingly you can choose the length of Nano-Tube diffuser depend on the size of pond.

  • Installation facility

    With Fi air diffuser very convenient to install aeration system for shrimp farming, hatchery, etc. Fi keeps pond floor clean, prevents accumulation of mud.

  • Cleaning easily

    Fi structure is simple, easy cleaning and hygiene. Cleaning quickly, save cost and labor. Higher survival rate, lower mortality rate, high density stocking.

  • Low-cost in maintenance

    After usage time, the amount of bubbles diffuse from the Nano-Tube will decrease, famer can replace the new Nano-Tube entirely, without thinking about costs.

Fi Air Diffuser Advantages

Fi air diffuser is not just necessary for survival of the shrimp and fish,
but a high level of DO has many advantages as well:

  • 60% Save cost
  • 70% Low maintenance
  • 50% Easy clean
  • 75% Time-saving
Reparing Fi air diffuser


Fi parts; Nano-Tube hose; PVC tube (2"); PVC glue; Scissor (or steel saw); Sand & Cement.

Assembling Fi air diffuser


Stick 1 Fi part into PVC tube; Mixing Sand + Cement to fill PVC tube; Stick one more Fi part to end of PVC tubing.

Connecting Fi air diffuser

Joint (straight)

After completing the assembly, the next step is the connecting Fi part to the steam pipe (1/4").

Testing Fi air diffuser


Complete the connection to the steam pipe, start up to test before taking water into the pond.

Vertical Fi air diffuser

Joint (vertical)

To connect into the steam pipe as square shaft, using the elbolw 3/8" x 3/8" to joint the air-house.

Operating Fi air diffuser


Complete the connection to the steam pipe, start up to test before taking water into the pond.

Are you ready to own Fi Air Diffuser?

Are you still hesitant? Please contact us for advice.


A crucial requirement for successful aquaculture is the management of water quality. “Water quality” is a general term referring to a number of physical and chemical parameters of water that affect the growth and health of cultured animals. Aquaculturists can achieve maximum productivity from a system by managing water quality parameters within optimal ranges for the cultured species. Water of sub-optimal quality can lead to the death of cultured species or reduce productivity by reduced feeding, decreased growth, suppressed gonad development, reducing spawning quality or quantity and increased susceptibility to disease.

Water quality parameters

Water quality parameters that are known to be important in the health of aquatic animals are temperature, dissolved oxygen, pH, salinity, ammonia, nitrate, nitrite, hardness, alkalinity, turbidity and the levels of toxic agents such as heavy metals, herbicides and pesticides. For the maintenance of good health and growth rate, the generally accepted ranges of the critical water quality parameters are provided below.

Water Parameter Marine Freshwater
Dissolved Oxygen > 4 mg/L > 4 mg/L
Temperature (°C) 24 - 33 21 - 32
pH 7.0 - 9.0 6.8 - 9.5
Ammonia (Total) < 1.0 mg/L < 1.0 mg/L
Ammonia (NH3,
unionised form)
< 0.1 mg/L < 0.1 mg/L
Nitrate (NO3) 1 - 100 mg/L 1 - 100 mg/L
Nitrite (NO2) < 1.0 mg/L < 0.1 mg/L
Salinity 15 - 35 ppt 0 - 5 ppt
Hardness (CaCO3) - 20 - 450 mg/L
Alkalinity (CaCO3) 50 - 200 mg/L 20 - 400 mg/L
Turbidity (secchi) 25 - 40 cm < 80 cm
Calcium / Magnesium - 10 - 160 mg/L
Hydrogen sulphide - < 0.002 mg/L

A lesson you will never want to experience

An oxygen crash or similar unstable water quality event can be devastating for a first-time prawn farmer. If left to occur unchecked, the dissolved oxygen concentration can drop to zero and an entire crop of prawns can be lost in a single night. Cleaning up the mess can be a huge task (and ‘emotionally draining’) because the pond must be emptied and many thousands of kilograms of dead prawns must be removed from the pond floor and buried in an appropriate location on site, before they become an environmental hazard. This comes after the farmer has incurred all the financial costs and done the hard work of growing the crop. A partial mortality can be equally detrimental, because when a significant number of prawns die in the pond, water quality will deteriorate severely and the subsequent stress on survivors may mean that the crop never recovers.