Pond Weeds Control

07 Apr

If Pond Weeds are a problem then avoid herbicides and permanently control pond weeds with the Natural CLEAN-FLO Pond Weed Control System

Pond Aeration System for Controlling Pond Weeds

The Perpetual Pond Weed Problem:


  • The cause of aquatic macrophyte (pond weed) growth and algae in ponds and lakes is an abundance of plant nutrients (fertilizers).
  • Fertilizers include phosphorus and nitrogen, carbon dioxide, minor nutrients such as sulfur and various micronutrients such as iron, manganese, magnesium, zinc, molybdenum, cobalt, etc.
  • Killing pond weeds often results in an algal bloom, and killing algae often results in heavy weed growth. It’s a dilemma that all pond owners face!

Pond Weeds versus Algae

  • Nutrients cause growth of either pond weeds or pond algae
  • Pond algae shade the water therefore pond weeds cannot grow.
  • If the problem is excessive pond weeds growth, the weeds take up the plant nutrients in the water therefore the algae cannot grow.
  • Some pond weeds such as water milfoil and hydrilla, get up to ninety percent or more of their nutrients directly out of the water instead of the sediment.
  • Ponds and lakes naturally shift every few years from weeds to algae or from algae to weeds. It all depends on what becomes established first in each season.

The Problem with Herbicides

  • Herbicides kill pond weeds
  • Herbicides ruin water quality as the dead weeds rot and release the plant nutrients they have taken up. As they rot, they also consume oxygen, causing a massive release of phosphorus and nitrogen from the bottom organic sediment (muck)
  • Fish kills often occur as a result of the associated oxygen depletion
  • Herbicides do nothing to remove muck (nutrients), nothing to improve water quality, reduce odors, or improve fish growth or health
  • The USGS cites pesticides as a “. . . potential concern for human health if they affect a drinking water source or occur where there is recreational use”
  • Herbicides are also a potential concern for aquatic life. (Robert Gilliam et al, 1999) There are hundreds of publications on the dangers of herbicides

If you kill all the weeds without eliminating its cause, the plants nutrient will still be left in the water. The pond weeds will quickly return, unless algae can shade the water before the weeds are established. Then you have a pond or lake full of algae. If it happens to be blue-green algae, it can extract nitrogen and carbon dioxide directly into the atmosphere. Blue-green algae can increase nitrogen coming into a lake up to eighty pounds per acre each year!

How can I control Pond Weeds?

Reduce Nutrients! Limit Pond Weed Growth!

Pond weeds and algae decline as a result of nutrient reductions. All submerged aquatic plants and pond weeds must absorb their major food and carbon dioxide from the water column not through the roots.

  • Install a Pond Aeration System with Diffusers

The CLEAN-FLO Continuous Laminar Flow Inversion and Oxygenation System exhausts carbon dioxide into the atmosphere, reducing carbon dioxide to such low levels that the plants starve.

  • Remove Phosphates
Submerged Pond Weed Control- Clean-Flo

BEFORE: Submerged pond weeds were so thick that one could not row a boat through them.

Results of Pond Weed Control- Clean-Flo

AFTER: Reduced pond weeds one year after CLEAN-FLO Continuous Laminar Flow Inversion and Oxygenation Aeration System was installed.