Performance under Pressure

Aeration Education Equipment Needed for Air Lift

Equipment Needed for Air Lift

There are 4 main components to a simple air lift.

  1. The Proper Hakko Air Pump
  2. Air Manifold. Optional – A Pressure Relief Valve
  3. Pipe or Tubing
  4. Air Diffusers or Air Stones

Choose the Hakko Air Pump based on the size and depth of your pond or lake. Use the chart below and the performance curves link to help determine proper size.
In general, Use a minimum of 10 liters per minute per 1000 gallons of water.

Fish Pond in GallonsLow Fish
Medium Fish
Heavy Fish
1,000 to 4,000 Hakko 40L Hakko 40L Hakko 60L
4,000 to 8,000 Hakko 60L Hakko 80L Hakko 100L
8,000 to 12,000 Hakko 80L Hakko 100L Hakko 120L
12,000 to 20,000 Hakko 100L Hakko 120L (2) Hakko 80L
Small Lakes up to 9 Feet Deep
1/8 Acre Hakko 40L - 60L
1/4 Acre Hakko 60L - 80L
1/2 Acre Hakko 80L - 100L
3/4 Acre Hakko 100L120L
1 Acre Hakko 120L

Air ManifoldsThe air manifold is very important for two reasons. It gives us the ability to send air to various areas within the pond or lake and allows us to vent off potential back pressure.

Connect the outlet of your HAKKO to a 6 or 12 way stainless steel manifold which is available separately. The manifold has valves which control the outlet of air to your air stones or diffusers. Alternatively, you may make a manifold with PVC parts and small ball cock valves ( available separately).

Pressure Relief Valve

It is important for the longevity of your HAKKO performance that you install a “BLEEDER VALVE”. The bleeder can be a secondary valve which is “cracked” open just enough to vent off excess back pressure. You may also use one of the existing outlets on the stainless steel manifold. Simply do not use one or two of the outlet valves and leave them open to bleed off excess back pressure. Using a bleeder valve will help ensure your warranty.

Always use large diameter pipe or plastic tubing to connect your manifolds and air diffusers.

Use “non kink” hose so it does not ultimately restrict air delivery to the pond. Self sinking weighted tubing is available. Use ½ inch diameter pipe as a minimum to connect to your air manifold. The air manifold should also be large diameter to reduce back pressure. Use heavy duty ¼” diameter airline tubing to your air stones. Do not use the small aquarium style airline tubing to connect your air stones. This tubing is too small diameter and kinks very easily. Contact one of your HAKKO Distributors link for the correct size tubing to maximize the performance of your air pump.

Air StonesThe 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.

Air stones will make a medium small bubble size. You can find air stones which make a very fine bubble however, these will not obtain a good speed in rising to the surface and will put a lot of back pressure on the air pump. The amount of oxygen that is diffused into the surrounding water from the bubble is small compared to the surge of upwelling water creating surface turbulence. A medium small air bubble will lift considerable water volumes to the surface for aeration and give better overall performance.

Air stones need periodic cleaning due to calcium and carbonate buildup from the water. Some areas around the country have hard water with a high calcium level. This calcium can eventually plug up your air stone and create unwanted back pressure on the air pump.

Ceramic style air stones can be cleaned in 100% muriatic acid for an hour to clear the calcium and return the air stone to like new performance. Clean your air stones 3 to 4 times per year in hard water areas and 2 times per year in soft water areas. This will keep your warranty valid.