More fuel for algae
Excess phosphorus can accelerate eutrophication—the enrichment of water that supports excessive algae and cyanobacteria. Some cyanobacterial blooms can produce toxins.
Phosphorus removal for impaired lakes
Remove phosphorus.
Restore lakes.
Measure the result.
Cascade Aquatics is developing modular nutrient-removal systems that target phosphorus where nature has already concentrated it—inside impaired lakes and in nutrient-rich inflows.
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Initially focused on freshwater lakes in Wisconsin, Minnesota, and Michigan.
The phosphorus problem
A small nutrient can reshape an entire lake.
Phosphorus is essential to aquatic life in normal amounts. Too much can push a freshwater lake toward eutrophication: nutrient enrichment that fuels excessive growth and destabilizes the lake’s ecological balance.
Phosphorus is not the only factor behind every bloom. But in many freshwater lakes, it is a key nutrient that limits how much algae can grow—which makes excess phosphorus an important restoration target.
Cloudier water and less light
Dense growth can reduce water clarity and shade underwater plants that provide food and habitat.
Oxygen stress
When algae and plants die, decomposition consumes oxygen. Low oxygen can stress fish and other aquatic life, especially in deeper water.
A problem that can recycle
In some lakes, low-oxygen conditions favor phosphorus release from bottom sediments, making stored phosphorus available again.
The visible consequences can include recurring blooms, surface scums, odors, poor swimming conditions, fishery stress, and lost recreational value.
Persistent impairment
Why some lakes don’t recover
Stopping new phosphorus at the source remains essential. Yet some lakes continue to experience blooms and poor clarity after major watershed improvements.
Phosphorus accumulated over decades can remain stored in bottom sediments. Under low-oxygen conditions, some of it can be released back into the water column and become available again. This internal loading can keep feeding the lake long after an original input entered it.
Source control slows what enters. It does not automatically remove the legacy phosphorus already cycling inside the lake.
Why physical export
Change the nutrient budget by creating a way out
Many restoration strategies reduce new inputs or keep phosphorus bound in place. Cascade is developing a complementary pathway: capture phosphorus into a controllable residual and physically remove that material from the aquatic system.
The goal is not simply cleaner water leaving a treatment unit. It is a measured reduction in the phosphorus mass available to recycle within the lake.
Source controlreduces what enters+Physical exportremoves captured phosphorus
Find a concentrated stream
Identify deep water, sediment-interface water, inflows, or events where more phosphorus can be reached per gallon treated.
Separate phosphorus outside the lake
Move phosphorus from the water into a controllable solid, media, or treatment residual.
Remove the captured material
Physically move the phosphorus-bearing residual out of the aquatic system instead of returning it with the water.
Measure what actually left
Pair flow with influent and effluent phosphorus concentrations to calculate exported mass and track lake response.
Physical export will not be appropriate for every lake, and it does not replace watershed controls. The nutrient budget must show that a realistic removal rate can matter.
A distinct pathway
Removal, not just management
Conventional phosphorus inactivation
Binds or immobilizes phosphorus
Treatment material is typically applied to the waterbody
Bound phosphorus remains within the lake system
Proven and highly effective in appropriate lakes
Cascade nutrient extraction
Captures phosphorus in a controllable treatment process
Preferentially treats water outside the lake
Physically removes captured phosphorus from the aquatic system
Creates a measurable phosphorus mass balance
Cascade isn’t anti-alum. We’re pro-removal.
Alum and other established approaches remain important restoration tools. Cascade is developing another option for lakes where permanent nutrient export may provide meaningful value.
The Cascade Method
Built around the lake—not the device
The process starts with the lake’s nutrient budget, then moves through targeted extraction, external capture, safe return water, and measurable verification.
The detailed technology and treatment train are selected only after the lake evidence supports them.
Explore the technology
Commercial pathway
From lake diagnosis to restoration
Cascade Assessment
Determine whether removal can materially change your lake.
Review the nutrient budget, candidate extraction zones, existing data, removal feasibility, preliminary permitting pathway, and the evidence needed for a go/no-go decision.
Request an assessmentCascade Treatability Study
Test real lake water before selecting a technology.
Compare capture approaches using actual water chemistry and estimate operating requirements, residuals, and removal economics.
Learn about treatabilityCascade Pilot
Prove removal in the field.
Deploy a modular field system to verify phosphorus mass export, operating performance, and ecological compatibility.
Become a pilot partnerCascade Restoration
Operate nutrient removal as a service.
Future multi-season systems centered on verified removal objectives—not on asking customers to operate a treatment plant.
Explore the pathwayFit before equipment
Not every lake needs Cascade
Permanent nutrient removal only makes sense when the nutrient budget supports it.
Can removing a realistic amount of phosphorus materially change this lake?
- Phosphorus is a primary water-quality problem
- Recurring algal blooms or persistent poor clarity
- Internal loading or concentrated inflows are meaningful
- External inputs have been reduced or are actively being addressed
- Nutrient-rich withdrawal or interception zones can be identified
- Historical water-quality information exists
Start with the lake
Could your lake become a Cascade pilot?
Cascade is identifying a small number of Midwest lakes with established data, evidence of internal loading or concentrated inflows, organized decision-making, and a strong interest in accelerating restoration.