BIOLOGICAL ALGAE CONTROL
stimulates algae growth?
Factors that directly affect algal growth include available
forms of nitrogen and phosphorus, sunlight, and temperature.
level of phosphorus does it take to stimulate algae growth?
Depending on geographical location, environmental
conditions, water column characteristics, etc., surface
water concentrations ranging from 4 - 20 ug/L can trigger an
3. How do
algae affect DO (dissolved oxygen) levels in the water
Periodic Oxygen depletion, resulting from algae respiration
and decomposition, can occur during algae blooms.
During the day algae take up carbon dioxide and release
oxygen into the water column through
photosynthesis. This can cause DO levels to increase. During
the night, algae take up oxygen and release carbon dioxide
into the water column.This
can cause DO levels to decrease. Algae, suspended below the
surface, cannot photosynthesize and, as a result, they
decompose. The decomposition process consumes dissolved
oxygen, and, as a result, DO levels in the water column can
EC-504 harm turf?
No, EC-504 also improves the water quality of irrigation
ponds by breaking down ammonia salts and other contaminants
before they reach the turf. EC-504 enhance turf health. The
microbes used in EC-504 are natural soil and water bacteria
that are an essential part of the mechanism for the
efficient transport of nutrients from the soil into the turf
Is EC-504 safe for fish?
Yes. By removing ammonia and
nitrite from the water, EC-504 enhances the aquatic
environment for fish and other wildlife.
What is thermal Stratification?
Typically, when pond water is warm and in full sun, oxygen
is consumed faster than is replenished. This can result in
thermal stratification in the water column. That is to say,
the warmer, oxygen rich upper layers of water are suspended
on top of the cooler oxygen deficient lower layers. When
this occurs, conditions within the pond environment change.
Beneficial aerobic bacteria become inactive and anaerobic
bacteria take over.
The rate, at which the biodegradable component(s) in the
bottom sludge layer is degraded, is significantly reduced.
Sludge accumulation increases.
Nutrient levels, in the bottom sludge layer begin to climb
resulting in algae bloom, excessive scum accumulations and
plant growth and higher ammonia and hydrogen sulfide levels.
Biological oxygen demand increases and dissolved oxygen
Will EC-504 work within the pond bottom and sludge layer?
Yes. EC-504 provides the correct
biomass for the entire pond, including the sludge layer. The
sludge layer can be the largest contributor of nutrients to
the pond for two reasons. (1) As organic matter, i.e.
leaves, grass clippings, fecal matter from fish, frogs,
birds, etc., degrades on the pond bottom, it releases
nitrogen and phosphorus (2) The bacterial populations in the
sludge layer can be damaged by herbicides, algaecides and
pesticides flushed into the pond during rainstorms. EC-504
will repopulate the sludge layer and degrade nitrogen and
phosphorous. This not only reduces the sludge layer volume
but also reduces the nutrients that algae need as an energy
How does EC-504 control odor?
The microbes in EC-504 attack the
cause of the pond odour, ammonia and slow decaying organic
matter. By accelerating and stabilizing the natural nitrogen
conversion reactions, EC-504 greatly reduces or eliminates
the release of ambient ammonia. Rapid digestion of
accumulated organic matter eliminates foul odour.
How does EC-504 clarify water?
EC-504 reduces the algae
population and digests floating and suspended organic matter
that clouds the water column.
EC-504 clear a pond of existing algae?
Yes, however, EC-504’s mode of
action is to “starve” the algae by out-competing for a
primary nutrient, nitrogen. Therefore, it is most
effective when used as a preventive maintenance program,
before algae commence blooming.
Is EC-504 compatible with algaecides or pesticides?
No, algaecides kill biomass and,
as a result, fewer nutrients are digested and the potential
for long-term algae problems increases. It is important to
note that the copper used in algaecides and herbicides
accumulates in bottom sludge causing an ever-increasing
toxicity problem for natural microbes.
Is EC-504 an algaecide?
No, EC-504 is not an algaecide.
EC-504 is designed to digest the algae’s primary growth
nutrient, nitrogen. It will not kill living biomass. EC-504
will help to re-establish a healthy, balanced aquatic
ecosystem. EC-504 is non-toxic, non-corrosive, and all
natural and will not harm animals, plants, birds, fish or
What about aeration?
EC-504 bacteria utilize dissolved oxygen in their digestive
processes. Typically, this does not affect the dissolved
oxygen concentration in a well-aerated pond. Aeration will
reduce or prevent thermal stratification and enhance the
effectiveness of EC-504, as well as benefit all aquatic life
present in the pond. It is recommended that all ponds, with
inadequate dissolved oxygen levels, be aerated.
Are permits or applicator’s licenses necessary?
Typically, no. EC-504 is not regulated and a permit or
applicator’s license is not required.
How is EC-504 used?
EC-504 is a pond management
program, not a one time, quick-fix chemical addition. As
such, it requires initial preparation and continued
attention in order to provide optimum results. An initial
heavy dose is required to rapidly populate the pond with the
necessary cultures. Seasonal golf courses require only one
initiation dose, while year round courses should be done
twice. The initial dose is applied at a rate of 3
lb./acre-foot of water.
What is the purpose of the maintenance dose?
EC-504 is a preventative
maintenance product. Accordingly, an application every two
to three weeks will ensure that biomass levels remain
sufficient to handle nutrient inflows. Water outflow,
irrigation, leaching and inter-species competition, with
less desirable microbes, can reduce biomass. Typically, each
treatment environment has a unique set of characteristics
that impact microbial activity and, as a result, the time
window to achieve the desire results will vary from pond to
filamentous algae grows on the bottom of shallow ponds and
on rocks and aquatic plants. Sometimes, filamentous algae
floats to the surface forming large mats. There are numerous
species of filamentous algae and, in some ponds, several
species can be present at the same time.
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