Aeration | Aeration Systems

Robust-Aire aeration system
Robust-Aire 1, ground cabinetRobust-Aire post mounted aeration system

2 – Robust-Aire by Kasco Marine



Need a plug and play aeration system for your pond or lake? Kasco Marine has designed the Robust-Aire aerators to be reliable, affordable, easy to install and maintain.  This item ships for free when purchased online.

$ 1,465.00$ 5,551.00

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Technical specifications

Application for Kasco Marine Robust-Aire aeration system:

For private ponds, lakes, reservoirs, retention ponds, dugouts, storm-water retention ponds or wherever aeration is required, Robust-Aire aerators are a good option for continuous, deep water aeration. But why is it important to aerate from the bottom of the pond or lake, rather than use a floating surface aerator? When oxygen is released at the bottom of a pond, more oxygen is transferred from the bubbles to the water within the first foot of water closest to the sediment level. The air from the bubbles creates favourable conditions for aerobic beneficial bacteria to thrive. It is the bacteria that do the work of nutrient removal from the water column and the sediment. In the presence of oxygen, more bacteria are available to work, which improves overall water quality. The Robust-Aire diffuser is well suited for deep ponds or ponds with steeply sloped floors. The diffuser is easy to lower into the pond from a row boat or kayak, and everything else is plug and play. has hundreds of clients who have purchased Robust-Aire aeration systems from us in the past and this system continues to be a very popular aeration system for adding much need oxygen to any water body. Our clients like how easy the Robust-Aire system is to install, they like the client support from us and the supplier, they like how their pond is transformed by O2 to the water column and they like the price tag to purchase and operate! Here are some other features:

Robust Aire 1 without cabinet

  • No electricity in the water, so it is safe for swimming, safe for animals and easier to maintain than surface aerators for example.
  • No floating equipment on the water’s surface reduces boating hazards while maintaining a more natural look to your pond.
  • No electricity required at the edge of a pond, as the compressor can be remotely installed. This reduces ambient noise while keeping the shoreline looking natural.
  • Suitable for deep water applications, up to 25 feet or 7.6 metres.
  • Cost efficient for small and large bodies of water.
  • Low maintenance on diffusers, compressors and tubing.
  • Standard 2 year warranty.

When you buy from you are buying from an authorized Kasco Marine dealer and repair centre in Canada. We have been a floating fountain and aerator supplier to thousands of clients in Ontario, Alberta, British Columbia, Quebec, New Brunswick, Nova Scotia, etc. for well over a decade.

Tech sheet piston compressors (PDF)

Preparing your compressor for winter (PDF)

Cleaning your diffuser with Biopurge (PDF)

Aeration system installation instructions (PDF)

Types of Robust-Aire aeration systems:

Various Kasco Marine Robust-Aire models are available to a maximum of 6 airlines per system. The RA1 system is suitable for a backyard or farm ponds, from 1/2 or 1.5  acres in surface area. The RA2 is suitable for up3-acre ponds, or smaller ponds that are kidney shaped or irregularly shaped. The RA3 is good for even larger ponds, 2 – 4.5 acres or ponds with islands, canals, variable depths, etc. The RA4 – RA6 are larger systems we tend to install in large lakes, golf courses, marinas or municipal Quays just to name a few examples. Our experienced staff can help you decide the size and configuration that would best suit your application.

  • RA1 – RA3 is available with Post Mount Cabinet, Base Mount cabinet or No Cabinet (just the bare compressor).
  • RA4- RA6 is available in Base Mount cabinet and No Cabinet options only.
  • Available in 60 Hz, 120V or 240V, also available in 50Hz, 230V for our European clients.

* Based on a depth of 8 feet and desired minimum turnover rate of 1 turn of complete volume per 48 hours. Sizing assistance is available.

 Superficie (en acres)
Surface acres
# de diffuseurs
# of diffusers
120V / 240V
CFM @ 10 PSITuyau lesté (pi.)
Weighted tubing (ft)
Profondeur max.
Max. depth
RA11.512.5 / 1.23.2100'50'
RA2322.5 / 1.23.2200'50'
RA34.533.1 / 1.84.8300'50'
RA4845.1 / 2.66.4400'50'
RA51056.2 / 2.98500'50'
RA61167 / 3.59.6600'50'

Kasco Robust-Aire Component:

RA1: Robust-Aire 1 system includes: Base mount cabinet, 1/4 HP single piston compressor, 1 Robust Aire diffuser, 100′ of 3/8″ tubing, necessary hardware and instructions.
RA2: Robust-Aire 2 system includes: Base mount cabinet, 1/4 HP single piston compressor, 2 Robust Aire diffusers, 2 rolls of 100′ of 3/8″ tubing, necessary hardware and instructions.
RA3: Robust-Aire 3 system includes: Base mount cabinet, 1/2 HP single piston compressor, 3 Robust Aire diffusers, 3 rolls of 100′ of 3/8″ tubing, necessary hardware and instructions.
RA4: Robust-Aire 4 system includes: Base mount cabinet, 2 x 1/4 HP single piston compressors, 4 Robust Aire diffusers, 4 rolls of x 100′ of  3/8″ tubing, necessary hardware and instructions.
RA5: Robust-Aire 5 system includes: Base mount cabinet, 1/4 HP + ½ HP single + double piston compressors, 5 Robust Aire diffusers, 5 rolls of 100′ of  3/8″ tubing, necessary hardware and instructions.
RA6: Robust-Aire 6 system includes: Base mount cabinet, 2 x 1/2 HP double piston compressors, 6 Robust Aire diffuser, 6 rolls of 100′ of  3/8″ tubing, necessary hardware and instructions.


A Robust-Aire™ energy efficient compressor injects air to the bottom of your pond through weighted, SureSink™ air-line hose, into the Robust-Aire diffuser assembly. The diffuser breaks up the air into bubbles which rise to the surface, transferring oxygen through the water, lifting and mixing water column and breaking up surface tension.


Kasco Robust-Aire rocking piston compressors:

  • Provides efficient, continuous-duty operation with minimal maintenance and quiet operation.
  • 25 psi pressure relief valve
  • Air filter with replaceable cartridge
  • Sound level is less than 70 dB without cabinet (Window air conditioner), 65 dB with cabinet and acoustic sound proofing (Normal conversation)
  • Safely starts under pressure. Maximum operating depth 40 feet.
  • Warranty: One-year complete warranty on all parts

Kasco Robust-Aire Cabinet:

Robust-Aire 1, ground cabinet

Choice of Base Mount Cabinet, Post Mount Cabinet or No-Cabinet (must be protected in a shed).

One size base mount cabinet for all RA1-6 systems
  • A large base mount cabinet is standard with any RA system. Ask about smaller post mount cabinet or no-cabinet options.
  • Dimensions of the base mount cabinet are 61 x 46 x 51cm (24 x 18x 20”)
  • 120-volt receptacle or a 240-volt junction box.
  • A single cooling fan provides 110 CFM ventilation
  • A Compressor is mounted at the factory in the cabinet which is provided with acoustical foam and a keyed cabinet lock.
Post Mounted Cabinet for RA1-3 onlyRA2-PM
  • Post mounted cabinet (PM) is mountable on an exterior wall or wooden post.
  • Dimensions 48 x 30 x 30 cm (19 x 12 x 12 in.).
  • 120 volt receptacle or a 240 volt junction box.
  • A single cooling fan provides 110 CFM ventilation
  • A Compressor is mounted at the factory in the cabinet which is provided with acoustical foam and a keyed cabinet lock.

Kasco Robust-Aire Diffusers

Robust-Aire diffusers are similar to a soaker-hose, designed to provide air bubbles with the least amount of pressure.

The base is made of thick HDPE plastic and a locking fill plug allows you to fill it with pea gravel or another weighted substrate. It has a Robust Aire Diffuser

raised design that keeps the diffusers performing at an optimal level above the pond bottom.

A durable bolted, strain relief attachment ensures that the weighted tubing will not become detached during installation or maintenance. A check valve with Viton seals keeps water from entering the tubing when the system is not operating.

Kasco Sure Sink Weighted tubing:Robust Aire Weighted Tubing

Included in the Robust-Aire aeration systems, easy to handle 100-foot coils of weighted air delivery hose. Robust-Aire systems 1- 6 include 100 feet of 3/8 tubing for each diffuser. Each coil is boxed and includes our full packet of barbed connectors and adapter fittings, and all-stainless steel tubing clamps. You will be prepared to make any connection necessary with the tubing kit. Additional and/or longer lengths of 3/8” weighted tubing is available when needed.  For long tubing lengths, a 5/8″ version of the Sure Sink tubing is also available and should be considered.

Need Linear Aeration? If what you need is a complete aeration system that uses bubble tubing rather than a Robust-Aire diffuser, contact us about a custom CanadianAir™ aeration system, for any sized pond or lake.