Medo LA-28B Air Pump

  • Life expectancy of 6 years can be seen with proper installation and maintenance of the pump
  • Quiet operation allows the pump to run without disturbing anyone while you relax pond side
  • Designed to self-adjust should the pressure exceed the rated value of the pump, the piston stroke will automatically shorten to reduce the strain on the pump
  • Environmentally conscious design allows the pump to operate with lower energy consumption as it requires only 50-60% of the line current typically used by diaphragm pumps
  • UL-listed for outdoor use
USA Koi Favorite... We use this at our shop and our new installations. At any given time we have at least 10 of these running!

Availability: In stock

MSRP $289.49

Our Price $249.99

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Medo Air Pumps

Several key points to consider when selecting an appropriate aerator for your koi pond are shown below.


The water depth at which the air is released into the pond will determine the primary operating back pressure of the pump. For every 1 foot of water depth, 0.43psi of resistance is encountered. The following chart provides the operating back pressure for the water depths indicated.


The overall water volume of the pond is a key factor in choosing an aerator. A rough estimate is that every 1000 gallons of water will need 40 liters of air per minute to sustain the appropriate dissolved oxygen level for koi. This is a general guideline. The number of koi and amount of vegetation in the pond also need to be take into consideration. Please consult your koi provider for a more comprehensive oxygen requirement evaluation for your koi.

For rated pressures and airflows, please refer to the LA series data sheets for particular model information. It should be noted that a pump's maximum air flow and maximum operating pressure cannot be achieved simultaneously. As the pressure on the pump increases, the air flow will diminish. In turn, if the pressure on the pump decreases, its air flow will increase. This is true with all linear pumps.

Always install your pond aerator above the water level of the pond. This will prevent water from being siphoned back into the pump when it is turned off. It will protect you from the danger of water and electricity coming in contact with each other.

1' 0.43
2' 0.86
3' 1.29
4' 1.71
5' 2.14
6' 2.57
7' 3.00
8' 3.43
9' 3.86
10' 4.29

Additional Info

Price $289.49
Our Price $249.99
Manufacturer or Breeder Medo

We offer Free Shipping on orders over $59.00!* Read below to get all of the details.

*Just purchase $59.00 or more to receive free shipping to the lower 48 states. Your products will be shipped using FedEx, UPS or the USPS. All charges will be deducted during check out when qualified purchased item(s) are placed into shopping cart. If you can not wait for the free shipping you can always select a faster method during check out. Unfortunately the free shipping offer does not apply to koi.

In addition to shipping direct from USA Koi in NJ we also ship from several warehouses scattered throughout the US and have the ability to ship direct from many of the manufactures that we carry. If possible we will always ship your products from the closest available warehouse.

Customer Reviews (1)

Awesome air!Review by BobO
I use a medo la28 to bubble my koitoilet aerated bottom drain and it works great at 4 feet deep. I run it in the spring, summer and fall but the koi really seem to like it in the summer when it is hot. Also there was no noticeable change in my electric bill! (Posted on 1/8/2015)

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