Robustaire Diffuser Systems for Deep Ponds



If your pond is greater than seven feet deep, on average, you to need us a diffuser system. Surface fountains and typical aerators don’t aerate deeply enough to get to the lower depths of deep ponds, depriving fish and your pond’s health of the benefits of aeration even at deep levels. The Kasco Pond aeration system is the best on the market for keeping even deep ponds properly aerated.

Kasco’s Robust-Aire™ systems are NOW 34% quieter and easier to maintain. These systems have been Independently tested to be up to 44% more efficient than the competition. Newly redesigned, these systems feature a significant reduction in sound (patent pending), larger air filters on 1/4HP and 1/2HP systems for less frequent cleaning, and a visual maintenance indicator to alert when maintenance is needed. Kasco employs several engineers and biologists to scientifically make recommendations for optimal pond health.

Robust-Aire systems pump compressed air from a shore-mounted compressor through self-weighted lines to a diffuser on the pond, lake or tank bottom. The diffuser then continuously releases micro-bubbles that rise to the surface carrying large volumes of water. This induces oxygen-transfer as well as beneficial water movement and mixing.

At 15ft. of depth, 2 diffusers will move 6300 gallons per minute (378,000 gallons per hour!) using 2.5 amps. That is only about .72 a day at $0.10 KW hour!

All Robust-Aire™ diffused aeration systems are available with an optional remote manifold allowing the compressor to be installed up to a mile away from the water’s edge.

Since ponds come in all different shapes and sizes, make sure to give us a call so we can help you pick the right Kasco pond diffuser. We can provide free professional advice on what would be needed for your particular pond, depending on its shape, size, and depth.

Kasco Aerator Product Features

  • Great for depths 7 feet and deeper
  • No electricity required in the water
  • Speeds up organic decomposition
  • Creates open water preventing ice damage
  • Designed for continuous operation


  • Compressor: 3 years
  • Tubing: 15 years
  • Diffuser: Lifetime
  • Cabinet: Lifetime

Kasco Diffuser Package Includes

  • Diffuser assembly
  • Mounting option
  • Compressor(s)
Part Number Number of Diffusers Voltage Phase Compressor Rolls of 3/8 in. Tubing (each roll is 100 ft.)
RA1-PM 1 120 1 (1) 1/4HP 1
RAH1-PM 1 208-240 1 (1) 1/4HP 1
RA2-PM 2 120 1 (1) 1/4HP 2
RAH2-PM 2 208-240 1 (1) 1/4HP 2
  • No electricity in the water
  • No equipment floating on or near surface
  • Effective in depths 8 ft. -50 ft. (2.5M-15M)
  • Designed and built for continuous operation
  • Low maintenance rocking-piston compressors
  • Compressor can be remotely installed – up to 1 mile away (1.6K)
  • Safety Tested; compressor ETL listed to UL and CSA Standards, 50Hz models CE marked
  • Compressor backed by a 3-year warranty
  • Diffuser backed by lifetime warranty
When you click on the BUY NOW button, you will be linked to our corporate website, Fountain Mountain, and can choose cable length options, light options, etc. You will not be charged until you add to cart and then checkout.
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