Air Pumps and Accessories - Underwater Warehouse

Air Diffusers & Manifolds Air Diffusers & Manifolds are a very convenient, and necessary method of distributing air to where it is requir...	Air Pump Boxes Many of the aeration systems are left out in the open. We offer a unique line of products to help you not only pr...	Airline Tubing This thick-wall, lead-free hose is the toughest on the market! Self weighted for super easy installation. U...
Airmax Eco-Systems Airmax-Eco produces a line of heavy-duty aeration kits for ponds ranging from 1 to 6 acres. AM30 Aeration Sy...	Gast Air Kits Gast Air Kits are custom designed and put together by our distributor utilizing their experience in complete system...	Gast Air Pumps Since 1921, Gast Manufacturing, Inc. has embraced its position as a leader in the design and manufacture of air-mov...
Gast Blowers The Gast full line of Regenair® Regenerative Blowers for high volume vacuum or compressed air applications offe...	Hakko Air Pumps Hakko Air Pumps are high volume diaphragm pumps designed for a variety of low-pressure applications. Koi pond aer...	Laguna Air Pumps Budget-friendly aeration kit enhances pond oxygen levels all year long. Provide vital oxygen during warm summer mon...
Medo Air Pumps Compact, quiet, and functionally vibration free, the highly reliable Linear-Piston Pump will enhance your system's ...	Pondmaster Air Pumps The Pondmaster® AP-Series air pumps have been designed to satisfy the requirements of a multitude of water-rela...	Windmill Aeration Go green! Let Mother Nature do the work for you when it comes to pond aeration. These wind driven aerators replace ...

Air is a very important item that you need to introduce into any pond, whether this is for a specialist Koi Pond - or just the garden pond.

Every living thing needs oxygen ... this of course includes Koi and also the bacteria that we need to provide for proper biological filtration.

Underwater Warehouse offers one of the largest selections of Quality Koi Pond and Water Garden Aeration Equipment. By choosing a link above you will be guided through our selection of Koi Pond air pumps, and supplies.

Aeration is vital to maintaining a healthy pond or water garden. You can accomplish proper aeration through the use of an aerator, or creating waterfalls and fountains.

The best air stone on the market is the ceramic stone type. They come in a variety of sizes and have a very long life. Choose the air stone size and quantity which will match the air output of your HAKKO. Most air stones are rated to deliver or allow a certain amount of air per minute. Usually they are rated in cubic feet of air per minute or CFM. A small air stone may only allow 0.05 cubic feet air per minute. A large size air stone might allow 0.5 CFM. If you use too small an air stone or too few, you will place excess back pressure on the air pump. You can increase the number or size of stones or use a pressure relief valve.
To convert your air pumps rating of Liters per Minute to Cubic Feet per Minute divide LPM by 28.25 to give CFM.

Example: your HAKKO 40L will deliver over 50 LPM at 58 inches water depth. 50 ÷ 28.25 = 1.77 CFM. A 1.5” x 1.5” ceramic air stone will allow 0.25 CFM, you should use at least 7 of this size air stone.

So how much air do you need?

These numbers are intended as a guideline. Your application may vary according to stocking levels. (In general terms, 40lpm per 1000 gallons is a good rule of thumb.)