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Oxygen is the single most important
water quality parameter there is when it comes to managing your
lake or pond. The sufficient amount of oxygen varies from pond to
pond and lake to lake. Much of it centers on the biological oxygen
demand (B.O.D.) and water temperature. Aquatic
Biologists, Inc. offers a complete line of aeration equipment and
products to meet your needs. If you are unsure of what components
you need for your aeration system please take the time to fill
out an Aeration Proposal Request Form (pdf). Our biologists will be
happy to assist you.
There are many ways in which to aerate
a body of water. Most of the available devices used today are
covered here. The main objective for using an aeration system is to
provide sufficient dissolved oxygen to the water column. Although
fish consume oxygen from the water column, their excrement asserts
a higher B.O.D. As feces and other organic litter builds up on the
bottom, it forms sediment composed of a large percentage of organic
material. Microorganisms, on the bottom of the pond, feed upon this
organic matter and subsequently use up the available oxygen. During
nighttime hours, plants and algae further reduce the available
Compressors | Diffusers | Cabinets | Air Hose | Options &
Accessories Epilimnetic (Surface) | Directional Flow |
There are four basic approaches to lake
and pond aeration; Diffused (Bottom), Directional Flow,
Epilmnetic (surface) & Hypolimnetic. Each approach has
distinct benifits to suit individual lake and pond aeration
Aeration -- Destratifies the water column making oxygen
levels and temperature uniform throughout the lake or pond, thus
the lake tends to be warmed. Diffused bottom aeration systems pump
air into the water. Systems of "fine bubble diffusers" are placed
near the bottom of the water body. Compressed air is pumped through
underwater airlines to the diffusers. The air then bubbles out
through the diffuser membrane and rises through the water column to
the surface. When released at the bottom of a pond or lake,
compressed air naturally begins to migrate towards the surface of
the water. As air travels up the water column the pressure,
surrounding the bubbles slowly decreases causing the bubbles to
increase in size. A slight current begins to develop. The current
draws oxygen-depleted water and noxious gases from the bottom,
oxygenates it and transports it to the surface. When the diffused
air bubbles reach the lake or pond's surface, a gentle boiling is
produced. The "boil" allows the noxious gases to escape the pond.
These systems are extremely
effective in destratifying a water body and are Aquatic Biologists,
Inc. preferred method of aeration due to its many benefits.
Directional Flow -- Used to turn stagnant, still
or low flowing water into a stream environment while adding oxygen
into the water column. Creating the stream environment may help
limit the reproduction of mosquitoes in your area. In summer
months, directional flow devices can be used to keep floating
debris out of bays, marinas and canals; as well as around docks and
beaches. Many directional flow devices can be angled downward to
destratify ponds to about 18' in depth. Circulators can also be
used to eliminate stagnant water and may reduce mosquito breeding
grounds in the summer; and in winter months to prevent winter kill
of your fish population. Equipment
Aeration - Adds dissolved oxygen to the top layer of the
water column (the Epilimnion). These devices quickly add large
amounts of oxygen into a small area. Epilimnetic surface aerators
function by moving a large volume of water (800 - 1300 gpm)
approximately 2 - 4 feet into the air where the water takes on
atmospheric oxygen before it returns to the lake or pond. As a
result of the massive amount of water being pumped into the air and
splashing back down onto the pond's surface, a wave action radiates
outward from the device toward the pond or lake perimeter. This
process thereby increases gas transfer within the pond, inducing
circulation as the water mixes and improving water quality while
producing generally warm temperatures and high oxygen content
(important to fish and other creatures) throughout the layer.
surface aeration does not improve conditions in the hypolimnion or
at the soil/water interface, which is often where aeration is
needed the most. Epilimnetic surface aeration uses more electricity
than other types of aeration that produce an equivalent amount of
Aeration - This method brings oxygen to the hypolimnion
without destratifying the water column. A major advantage of this
method is that different temperature layers are maintained,
allowing a diverse fishery to be developed. Cold water fish (e.g.
trout) are able to live in the colder water available within the
hypolimnion while warm water fish species (e.g. blue gills, bass)
are able to live and thrive within the epilimnion. Equipment
The heart of any lake-bed, or
bottom-mounted aeration system is often the air compressor itself.
ABI offers a variety of compressors that are quiet, small, energy
efficient and will pump a steady and constant flow of oxygen to
your diffuser system.
The key considerations when deciding
which air pump, compressor or blower (different ways of moving air)
to buy are what volume of air (in cubic feet per minute, cfm) you
need, where the diffusers are located, distance of each diffuser
location from shore and the pressure (in pounds per square inch,
psi) required to supply that volume. Keep in mind it takes 1 psi to
push an air bubble 27" below the surface of water. All air
compressors used for aquatic purposes should be "oil-less".
Electrical costs are often times a
concern when determining the viability of an aeration system.
Electrical costs may be determined by how many watts each
compressor will use to operate. Don't worry about amps-they are for
sizing breakers. Wattage consumption can be determined by using the
Single-phase watts= volts x amps x power factor
Three-phase watts = volts x amps x 1.73 x power factor
All of our compressors are sold with
a manufacturer's warranty of 1 year, although our field experience
indicates they last for many years if properly operated and
maintained. For best results, all compressors should be placed and
secured in a well-ventilated cabinet, to prevent deterioration of
electrical components, rusting, and voiding of the warranty.
Linear compressors fill the gap between aquarium air pumps and
ponds. They are energy efficient and offer higher pressure
capabilities than other brands. They are ideal for use in bait
shops, classrooms, koi ponds and laboratories.
Linear motors operate on
electromagnetic oscillation which eliminates sliding parts, thereby
reducing noise, minimizing power usage and extending motor life. A
minimum of 35,000 hours continuous operation is expected from most
models before any service is needed.
Our linear compressors are enclosed
in a weather resistant enclosure that provides additional sound
proofing as well as protecting the motor.
Continuous-duty, oil-free rocking
piston compressors are the highest performing compressors available
today. Rocking piston compressors are a great choice for continuous
operation applications, possessing high pressure capabilities while
operating at lower rpm's. These features allow them to run cooler
and last longer, while using less electricity than similar
compressors. They are the perfect choice for aerating small ponds
or deep water applications (to 30 psi). ABI's line of rocking
piston compressors are equipped with noise reducing intake air
filter, pressure relief valve, 3-foot power cord and thermal
Our top selling compressor Purchase Compressor
Oilless rotary vane compressors are
compact, easy-to-service and excellent for moderate-pressure,
continuous-duty applications. They more than double the air output
of piston compressors with better longevity. The carbon vanes self
adjust for years of maximum efficiency and can be easily replaced
in about 15 minutes using common tools.
Thermal overload protection, air filter, inlet check valve and 3'
power cord is included.
All of our rotary vane compressors are performance tested and
covered by a one-year warranty (not including air filters, vanes,
water damage or lightning damage). Although all models can be
rewired in the field, it's best if you specify required voltage
when ordering, so we can supply the correct power cord (all
single-phase models will be wired 115V if not specified).
Three-phase models ship with no power cords.
Piston Purchase Compressor
Piston air compressors are for
applications requiring higher pressures than our rotary vane
compressors are capable of providing. These 50-psi models deliver
much more air than the 100-psi models normally found in the
Whether you're aerating a deep water lake, overcoming the friction
loss of a long run of air piping or forcing air through a fine pore
diffuser, these compressors provide a continuous supply of oil-free
air. Due to amp draw, 115V models do not have power cords.
One-year warranty. Made in USA.
Maximum operation depth 25'
Aeration is most effective when the
air bubbles are very small. Small bubbles increase diffusion of
oxygen from the air into the water. More importantly, the rising
bubbles circulate the water in the lake or pond. The smaller the
bubbles, the more efficient they are at both oxygen diffusion and
circulating the water.
An aerator's standard aeration
efficiency (SAE) is an important consideration when comparing one
aerator with another. The SAE can be calculated by measuring the
aerator's oxygen transfer and the amount of energy used per
horsepower, per hour, under standard conditions. An SAE of 2.1, for
example, means that 2.1 pounds of oxygen per horsepower, per hour,
are transferred to the water under standard conditions. The higher
the SAE, the higher the oxygen transfer, the higher the
However, SAE numbers are a fair
comparison only when comparing aeration equipment of the same exact
type. You cannot use the SAE as your only tool in the selection of
an aeration system. Our diffuser comparison page is available to
help understand and compare the efficiencies of different air
diffusers we have.
ABI Predator Diffuser Series
The NUMBER ONE Aeration Choice For Lakes & Ponds
ABI Predator diffusers are designed specifically to maximize
aeration efficiency. Diffuser selection is based on "certified"
performance standards directly correlated to CFM delivery rates and
water depth. Predator series diffusers are engineered to out
perform any and all other diffusers primarily because of their flow
through design and active surface area.
Aqua Bio I & II
Bio diffuser utilizes a specially manufactured porex tubing to
create the formation of fine micro bubbles (50 - 500 microns) in a
360 degree radius around the entire length of tubing. Stainless
steel plate allows for extended life and protection of the diffuser
tubing while maintaining the diffuser above the soft sediment.
Three year limited warranty. Purchase
AquaAirTM provides ponds and lakes
with superior aeration, circulation, and de-stratification.
Dissolved oxygen (DO) levels are increased throughout the entire
water column with the use of bottom-mounted diffusers. The
diffusers employ a super fine micro-bubble technology resulting in
the highest diffuser oxygen transfer rates (OTR) available today.
The micro-bubbles entrain bottom water and synergistically lift it
to the surface where atmospheric oxygen is absorbed and then
transferred throughout the water column.
AquaAirTM aeration systems offer the following lake and pond
Purchase compressor cabinet
It is extremely important to protect
the compressor of the aeration system from the elements. Without a
protective cabinet, compressors can be easily damaged by severe
weather or, in the case of a power failure, could be destroyed by
any condensation entering into the compressor housing.
Aquatic Biologists, Inc. carries a
wide variety of compressor cabinets to fit every need. Choose from
steel, cedar, fiberglass, aluminum, or rock cover design as above
ground cabinets. Underground cabinets, which can be totally hidden,
are also available. All cabinets come with lockable hasps, vents,
and either 115 or 230 volt 140 CFM circulating fan and filters to
provide continuous clean air flow and cooling.
Aquatic Biologists, Inc. primarily
uses self-sinking airhose for the aeration systems we design. Our
self sinking airhose is manufactured exclusively for ABI and our
distributors to aerate lakes and ponds.
FLEXIBLE SELF SINKING AIR HOSE
Manufactured Specifically to Aerate Lakes and Ponds
Indestructible, kink-proof airline eliminates the need for
weighting down traditional semi-rigid airline.
Larger sizes are available for lake
aeration systems or where the length of airline for a single
diffuser is over 1,000 ft..
AERATION OPTIONS &
Wind Powered Aerator
Although not nearly as
efficient as diffused air systems, windmill aerators are a great
option for remote ponds. The windmill can be located hundreds of
feet from the pond. Allowing placement in the windiest location.
Tubing is run from the windmill to a diffuser at the bottom of the
pond. Choose from 12' to 20' tower. Double diaphragm windmills are
also available, which increase windmill efficiency by 240 percent.
Diffuser depth placement is very important. Do not install below
Solar Powered Aerators
Solar Powered units are available - Consult with an ABI
Winter aeration will maintain open water. This may pose a problem
to people or animals falling through the ice. Ice domes solve this
problem by allowing the diffused air to escape up through the dome
vent. This allows ice to form around the dome. Ice domes may also
discourage geese from staying around too long in the fall.
EPILIMNETIC (SURFACE) EQUIPMENT
Achieve excellent aeration
results while maintaining a low profile. This chemical-free process
is created by combining a floating electric motor operating at 1725
RPM with a high-efficiency stainless steel propeller system. The
random boil effect results in an oxygen transfer rate starting at 3
lbs. per hour. This continuing cycle of oxygen circulation and
induced wave action prevents thermal stratification and supports
aerobic bacterial action, resulting in clearer, cleaner, odor-free
Oxymax® systems work from the bottom
of the pond, completely submerged, out of sight and silent. This
system couples an electric motor with a propeller water-transport
system. The oxygen-depleted water is moved rapidly from the bottom
of the pond directly and efficiently to the surface. This cooler,
denser water absorbs oxygen as it quickly spreads across the pond.
It returns down through the stratified layers, providing equal
distribution of oxygenated water.
According to independant testing
conducted at Auburn University, Kasco's Pond Aerators possess SAE
(Standard Aeration Efficiency) of 3.0 lbs. of oxygen per horsepower
per hour of operation or greater. All Kasco Pond Aerators are
self-contained units that float at the surface with a single power
cord returning to shore, which makes them extremely easy to move
and install with a single person.
Kasco Pond Aerators are perfect for
continuous duty or as a supplement supply of aeration during times
with low oxygen levels and with minimum operating depths as low as
15", they can be used in almost any situation with great
Kasco Pond Aerators agitate high
volumes of water at the surface to maximize exposure of water to
the air for gas exchange.
Kasco Pond Aerator Features:
Kasco Aerators are available in the
following models. All include a float and two (or three) 50'
braided nylon mooring ropes and are available with 50', 100', 150',
or 200' SJTOW underwater rated electrical power cords.
DIRECTIONAL FLOW EQUIPMENT
Air injector systems draw in oxygen
from above the water's surface through an air-intake tube powered
by a submerged electric motor. The oxygen enters the propeller
chamber, where it is mixed rapidly by a specially designed
propeller. The propeller breaks down the aspirated oxygen into fine
bubbles while mixing them with water entering through the protected
intake chamber. These bubbles are then thrust via the propeller
into the water, providing horizontal circulation of oxygen.
Water movers are great for shallow ponds where diffused aeration is
inefficient. Moving water insures that otherwise stagnant areas
receive oxygenated surface waters. The moving water is also a
deterrent to unwanted algae growth. Kascos can also be used to
reduce organic sediment by moving oxygenated water toward the
bottom of the pond. This replenishes the bottom oxygen content, and
encouraging the growth of microbial organisms. Kascos can also be
used to keep open water during the winter. They are great for
around boat docks.
An optional dock mount is available
to attach directly to a boat dock or a treated 4x4 spike driven
into the pond bottom. They can also be suspended from a float ring.
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