The cause of aquatic macrophyte (weed) growth and algae in lakes is an abundance of plant nutrients (fertilizers). These include phosphorus and nitrogen, carbon dioxide, minor nutrients such as sulfur and various micronutrients such as iron, manganese, magnesium, zinc, molybdenum, cobalt, etc. This is why killing weeds often results in an algal bloom, and killing algae often results in heavy weed growth.
The nutrients must go somewhere. They will go either into weeds or algae. Algae shade the water so weeds cannot grow. If the problem is excessive weed growth, the weeds take up the plant nutrients in the water so the algae cannot grow. Some aquatic 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. 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.
As you know, herbicides kill weeds. They also 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. 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. They 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 in a lake without eliminating the cause of the weeds, the plant nutrients are still in the water. The weeds will quickly return, unless algae can shade the water before the weeds are established. Then you have a lake full of algae. If it happens to be blue-green algae, it can extract nitrogen and carbon dioxide directly out of the atmosphere. Blue-green algae can increase nitrogen coming into a lake up to eighty pounds per acre each year.
Aquatic weeds and algae decline as a result of nutrient reductions. All submerged aquatic plants must absorb their major food, carbon dioxide from the water column; not through the roots. Clear Pond Oxygenation System exhausts carbon dioxide to the atmosphere, reducing carbon dioxide to such low levels that the plants starve.
To accelerate the removal of phosphates and limit plant and algal growth, we add our formulated beneficial bacteria and enzymes. Each program is designed based on water quality data and existing conditions of a particular water body. With the Lake Cleanser applications and aeration we typically remove over 97% of the phosphate in the water column. Inversion, aeration and Beneficial Bacteria and enzyme formula to improve water quality reduces nutrients (fertilizer) needed for aquatic macrophyte (weed) growth.
Lake Cleanser Special Clear Pond Lake Cleanser Special is a buffered alum compound and Bacteria specially formulated to precipitate phosphorus in lakes, ponds and water reservoirs with water retention times greater than 60 days, without lowering the pH of the water more than 0.1 - 0.2 pH units.