lake restoration – Aquarius-Systems

New Questions About ProcellaCOR and Eurasian Watermilfoil Management

Tue, 16 Jun 2026 18:12:24 +0000

Eurasian watermilfoil is one of the most widespread and challenging aquatic invasive plants found in lakes and waterways across North America. This submerged aquatic plant grows rapidly, forming dense underwater stands and thick surface canopies that can interfere with boating, fishing, swimming, and other recreational activities. In many water bodies, invasive milfoil can also outcompete native vegetation, reducing plant diversity and altering aquatic habitat.

Managing Eurasian watermilfoil often requires a long-term commitment and a combination of management techniques. Mechanical harvesting, hand removal, bottom barriers, biological controls, and aquatic herbicides are all commonly used to reduce infestations and improve waterway access. Each method offers advantages and limitations, and many lake managers rely on integrated management programs that combine multiple approaches to achieve their goals.

One herbicide that has gained significant attention in recent years is ProcellaCOR®, a selective aquatic herbicide designed to target invasive plants while minimizing impacts on many native species. Lake associations and resource managers across the country have used ProcellaCOR to combat persistent milfoil infestations, often reporting successful control of invasive growth and improved conditions for recreation and native plant recovery.

However, as with any management tool, questions remain about potential long-term effects and environmental persistence.

Findings from Lake George

Following a ProcellaCOR treatment in Lake George, New York, researchers conducted independent sampling of water, sediment, and aquatic plants to better understand how the herbicide behaved within the ecosystem after application.

According to the study, degradants associated with the herbicide were detected in the upper layer of sediment five months after treatment. Researchers also reported finding the herbicide’s active ingredient, florpyrauxifen benzyl, in deeper sediment layers more than a year after application.

These findings have generated discussion among lake residents, scientists, and resource managers regarding how herbicide compounds interact with lake sediments and whether long-term accumulation may occur under certain conditions.

Balancing Benefits and Concerns

For many lake communities, ProcellaCOR has become an important tool in the ongoing effort to control invasive milfoil. Dense infestations can significantly impact recreation, property values, water flow, and native aquatic plant communities. Effective control methods can provide substantial benefits when invasive species threaten the health and usability of a lake.

At the same time, some residents and environmental advocates have expressed concerns about possible unintended consequences of repeated herbicide use. Questions have been raised regarding sediment persistence, impacts on non-target organisms, and the long-term effects on lake ecology. While current research continues to evaluate these issues, many stakeholders are calling for additional monitoring and independent studies to better understand the full environmental picture.

The Importance of Integrated Aquatic Plant Management

The debate surrounding Eurasian watermilfoil management highlights the complexity of aquatic ecosystem stewardship. There is rarely a single solution that works for every lake or waterway. Factors such as infestation size, waterbody characteristics, management goals, budget, and environmental considerations all influence the selection of appropriate control methods.

Mechanical harvesting continues to play an important role in many aquatic plant management programs by physically removing plant biomass from the waterway without introducing chemicals into the ecosystem. Harvesting can improve navigation, reduce nuisance growth, and remove nutrients contained within the harvested vegetation. In many cases, harvesting is used alongside other management strategies as part of a comprehensive aquatic plant management plan.

As research continues and new information becomes available, lake managers, regulators, and stakeholders will need to evaluate all available tools carefully. Ongoing monitoring, transparent reporting, and science-based decision making remain essential for protecting both recreational access and long-term ecosystem health.

The conversation surrounding ProcellaCOR and Eurasian watermilfoil management is likely to continue as additional studies are completed. For lake associations and water resource managers, understanding both the benefits and potential tradeoffs of available management options remains a critical part of maintaining healthy and usable waterways.

Long-Term Aquatic Plant Management on Lake Ripley

Fri, 21 Nov 2025 17:48:07 +0000

Misconceptions About Lake Health and the Risks of Chemical Treatments

Wed, 01 Oct 2025 15:32:25 +0000

Lakes across the country are struggling with harmful algal blooms, low oxygen, and declining fish populations. While these problems are often obvious at the surface, many management practices are based on misconceptions that don’t address the real causes. Instead of solving the issue, they often make lakes even sicker.

Chemical Treatments: A Short-Term Fix That Makes Things Worse
Many lake managers turn to algaecides and herbicides to control harmful algae. On the surface, these treatments may look effective, but the reality is very different.

When algae are killed by chemicals, the cells release toxins directly into the water. The dead material then sinks, decomposes, and consumes oxygen—creating hypoxic conditions that stress or kill fish. Low oxygen also triggers internal nutrient release from sediments, fueling the very blooms that the chemicals were meant to stop.

Instead of restoring balance, chemical treatments can lock lakes into a cycle of recurring blooms and declining water quality.

Looking at the Surface Isn’t Enough
It’s common to judge a lake’s health by what can be seen at the surface—clear water, healthy oxygen levels near the top, or visible fish. But many lakes stratify, with deeper waters cut off from oxygen. While the surface looks fine, the bottom layers can be oxygen-depleted and nutrient-rich.

Fish crowded near the surface aren’t thriving—they’re escaping conditions that are deadly below.

Runoff Isn’t the Only Problem
Nutrient runoff from land is an important driver of algae, but it’s not the only one. Sediments at the bottom of lakes often act as storage banks for phosphorus and nitrogen. When oxygen levels drop, these nutrients are released back into the water, feeding new blooms year after year.

Focusing only on reducing runoff misses the internal nutrient cycle already at work inside the lake.

The Limits of Simple Metrics
Common tools like the Trophic State Index (TSI) are often used to measure lake health. But they mostly track surface-level data like clarity and nutrient concentrations. These numbers don’t reveal what’s happening in deeper waters, or how sediments and oxygen loss are driving long-term decline.

A Call for Smarter Lake Management
The misconceptions around lake health—and the overreliance on chemicals—are keeping many lakes stuck in poor condition. Chemical treatments may offer short-term relief, but they create long-term problems.

To break the cycle, management strategies need to focus on oxygen restoration, sediment nutrient control, and ecosystem balance. Prevention and smarter monitoring are also key to creating lakes that are resilient, healthy, and able to support aquatic life for generations.

Lake Killarney Restoration Removes One Million Pounds of Weeds

Tue, 10 Dec 2024 16:59:53 +0000

Lake Killarney in northeast Tallahassee is undergoing its first major cleanup in decades, addressing years of overgrowth that made the waterway inaccessible for residents. Using a specialized aquatic weed harvester, over one million pounds of invasive vegetation were removed in just one week, with more progress to come.

The cleanup effort aimed to improve water quality and restore the lake’s ecosystem, which had been impacted by excessive vegetation. This significant environmental effort highlights the importance of preserving natural water bodies and ensuring sustainable ecosystems. Unlike chemical treatments, harvesters provide an eco-friendly method of managing vegetation with immediate results.

Aquatic weed harvesters play a crucial role in maintaining healthy water ecosystems by removing excessive vegetation. Without intervention, this vegetation eventually dies and decomposes, releasing nutrients into the water that can fuel harmful algae blooms. These blooms deplete oxygen levels, harm aquatic life, and diminish water quality, making weed harvesters an effective, environmentally-safe solution to prevent such environmental issues.

Chestermere Removes Over 210,000 kg of Lake Weeds

Tue, 26 Mar 2024 21:07:04 +0000

The City of Chestermere, Canada, announced that they had harvested 210,675 kilograms of weeds from Chestermere Lake in 2023.

“I know how important the water is to residents who live adjacent to it and all residents of Chestermere. Weed harvesting and weed control are an uppermost issue in most people’s minds,” interim CAO Pat Vincent said.

Chestermere Community Operations removed 132.5 harvester loads of weeds in 2023. Compared to 2022, when they removed 254.5 loads.

“We have been dealing with a flowering rush infestation, and it seems were enjoying some success in 2023 with the amount of flowering rush being removed from the lake is significantly lower than 2022, which to me is a good sign that we have been dealing with this issue effectively,” Vincent said.

The vegetation is then composted and used throughout the community.

Lake Minnewawa Restoration Shows Long-Term Benefits of Harvesting

Fri, 22 Dec 2023 19:20:27 +0000

In the 1970’s Lake Minnewawa in Minnesota was so choked with weeds that residents could no longer enjoy the lake as they once had. The water clarity and the phosphorous levels were awful. People would pull their docks out of the water in July because boating was impossible.

Save Minnewawa Association was formed in 1977 and they purchased their first aquatic vegetation harvester in 1982. Since the harvester has been in use, not only have the amount of weeds decreased, but the water clarity has significantly increased.

A big reason for this is because there are fewer weeds dying in the lake and decomposing in the bottom of the lake. Also, the weeds contain a huge amount of phosphorous which is being removed along with the weeds. The more phosphorous in a lake, the more algae growth, therefore the lower the water clarity.

The board has heard the suggestion of controlling the weeds by using chemicals instead of the weed harvester. The cost of the chemicals is very prohibitive though. It was $250,000 dollars and the lake had to be treated twice a year for the first 5 years; a price tag of a half million dollars. Compared to approximately $25,000 a year it takes to run the weed harvester.

Chautauqua Lake Harvesting Removes Over 7,700 Tons of Weeds

Thu, 21 Dec 2023 20:48:13 +0000

Crews employed by the Chautauqua Lake Association removed 15,584,000 pounds or 7,792 tons of nuisance plant material from the lake this past summer. Also lending a hand were volunteers from Cummins Engine and workers from the county’s Welfare-to-Work Program.

Excerpt from Chautauqua Lake Association Newsletter

The CLA currently has the equipment, knowledge and manpower to continue the annual task of plant harvesting. Harvesting has a low impact on aquatic habitat, compared to other options is inexpensive and greatly improves our lake conditions for the community.

Harvesting is a need that Chautauqua Lake in New York will have even if other options are taken. We have participated in both dredging and spraying in the past. Experience, scientific recommendations and the information from other lake communities advises us of the constant need for harvesting.

Wauconda Increases Harvesting Efforts on Bangs Lake

Thu, 21 Dec 2023 19:00:44 +0000

The Village of Wauconda’s lake weed harvester began operation for the season on May 4th. This year it has been operating five days a week, with some of those days having extended hours. To date, 382 cubic yards of aquatic plants have been removed from the lake…which is 64 truckloads of lake weeds disposed of just this year! During the same period last year, 94 cubic yards of aquatic plants were removed from the lake.

The mild winter and warm spring have contributed to the explosive growth of two invasive weed species. To better control the weeds, the Village of Wauconda is developing a comprehensive multi-year lake management plan. The goal of the plan is to evaluate Bangs Lake and determine the best courses of action necessary to establish and maintain proper balance between aquatic plants, fishery, animals, and other elements so that Bangs Lake remains a healthy and viable body of water for year-round active and passive recreation.

Bellandur Lake Cleanup Removes Thousands of Tons of Weeds

Tue, 19 Dec 2023 22:06:46 +0000

Around 3,707 tonnes (4086 tons U.S.) of weeds have been cleared from the 910-acre Bellandur lake. In the past five days alone 737 tonnes (812 tons U.S.) have been removed by just two machines, according to an official release issued by the Bangalore Development Authority.

The BDA is said to be using three weed harvesters — one long boomer and two floating excavators — which were introduced on the lake only on June 2, 2017. While one weed harvester cleared 340 tonnes from May 29 to June 2, the second one cleared 410 tonnes.

Water Hyacinth Shows Promise in Removing Toxic Chromium-6

Tue, 19 Dec 2023 21:42:46 +0000

Heavy metal poisoning is a growing concern in many parts of the country. A new method for removing chromium-6, a highly toxic heavy metal, from waste water has been developed by a group of scientists from India and Ethiopia. They claim it to be low-cost and safe.

The new method uses water hyacinth, a weed known for its ability to spread rapidly over water bodies. It is used for cleansing polluted water bodies owing to its remarkable capacity of absorbing pollutants.

In the new study, hyacinth was made into a powder and then mixed with water containing chromium-6. The powder was allowed to settle down and after two minutes the liquid above the powder was removed and analyzed for chromium-6. It was found that chromium-6 levels decreased significantly in water.