
Phosphorus removal

Protect public health and preserve sensitive ecosystems with our complete range of phosphorus removal options, specially designed to prevent harmful algae blooms in the lakes and rivers around your property.

Prevents property contamination.
Preserves water quality in lakes and rivers.
Protects public health.
Installed for life.
24/7 autonomous operation.
Minimal maintenance.
Custom designs to meet your exact needs.
Optimized coagulant injections.
Sensors detect low coagulant levels.
What is phosphorus removal?

Phosphorus removal is a wastewater treatment option for properties in ecologically sensitive areas, where strict effluent standards are needed to protect lakes and rivers for future generations.
We offer phosphorus removal options for a wide range of residential, commercial, and municipal projects.
Each system safely isolates phosphorus compounds to ensure treated wastewater never contributes to harmful algae blooms in nearby watercourses.
Why is phosphorus removal important?
Phosphorus is a nutrient that is commonly found in wastewater. If it is discharged into the environment without proper treatment, it can enter nearby watercourses via groundwater or runoff.
Either way, the environment suffers.
Too much phosphorus causes an overabundance of algae in aquatic ecosystems. Algae blooms prevent sunlight from reaching native plants below the surface, resulting in their death. Bacteria that feed on decaying plant matter then increase in number, consuming more and more oxygen until larger species like fish and shellfish suffocate.
At this point, the once healthy watercourse can no longer support life. It becomes a dead zone.
The damage phosphorus can cause to our environment, health, and economy is dire.
- invasions of non-native species
- reduced biodiversity
- toxins in fish and shellfish
- human illnesses
- livestock poisoning
- reduced waterfront property values
- limited enjoyment of lakes and rivers
- lost revenues for commercial fisheries
The solution to this problem is simple: effective wastewater treatment systems that include one of our proven phosphorus removal options.
How do our residential phosphorus removal systems work?
Primary reactor
Wastewater first flows into a primary reactor. Solids that settle on the bottom of the reactor are called sludge. They are removed from the tank by a septic pumper as often as needed.
Electrocoagulation unit
Liquids leave the primary reactor and flow downstream into an electrocoagulation unit. This unit has two chambers: a reaction zone and a separation zone.
In the reaction zone, electrodes release aluminum particles that react with phosphorus in wastewater. This process, called electrocoagulation, transforms soluble phosphorus into solid compounds.
In the separation zone, solid particles gradually settle on the bottom of the tank. They are then pumped back into the primary reactor for removal.
Additional treatment and final dispersal
As solids sink to the bottom of the separation zone, clarified wastewater forms at the top. Depending on local regulations, this wastewater flows downstream into:
- our Ecoflo biofilter (with a Rewatec UV disinfection unit)
- a sand filter
- a leach field
After final treatment, wastewater is discharged into a ditch or watercourse for final dispersal.

Residential phosphorus removal system maintenance
We have a network of local service partners, annually trained by us to maximize the life of your residential Rewatec phosphorus removal system and to protect your investment in your septic installation.
When a technician visits your property, they will:
- measure sludge in the primary reactor
- advise you if the primary reactor requires pumping
- ensure all components are operational
- inspect and clean the system’s flow regulator
- verify if aluminum electrodes need to be replaced
- collect samples to verify treatment performance (when required)
Warranty
Our 5-year warranty for residential phosphorus removal systems includes:
- all tanks
- original tank parts and labor
- replacement tank parts and labor
How do our commercial and municipal phosphorus removal systems work?
Our commercial and municipal phosphorus removal options are ideal additions to our proven wastewater treatment systems:
- Ecoflo biofilter clusters
- Rewatec membrane bioreactors (MBR)
- Rewatec moving bed biofilm reactors (MBBR)
- Rewatec sequencing batch reactors (SBR)
In all systems, dosing pumps inject coagulant into wastewater. The amount of coagulant is optimized based on the installation’s actual flow rates.
Coagulation takes place in a static mixer. The mixer allows wastewater to react with the coagulant, transforming soluble phosphorus into solid compounds.
After coagulation, depending on the type of system used, solid phosphorus compounds either settle on the bottom of a primary tank or secondary clarifier, or they are blocked by a downstream filter.
These particles form sludge that is removed by a septic pumper as often as needed. Liquids, now with greatly reduced concentrations of phosphorus, continue downstream for additional treatment.
If needed, additional injection points can be added at different parts of the treatment train to optimize and better control phosphorus removal performance.
Commercial and municipal phosphorus removal system maintenance
We have a network of technicians and local service partners, annually trained by us to maximize the life of your commercial or municipal Rewatec phosphorus removal system and to protect your investment in your property.
When a technician visits your property, they will:
- inspect all system components
- measure sludge in sludge storage tanks
- check the flow rate of the pump to ensure coagulant is correctly dosed
- confirm that coagulant barrels are sufficiently full
- collect samples to verify treatment performance (when required)
Warranty
Our 2-year warranty for commercial and municipal phosphorus removal systems includes:
- original pumps
- replacement pumps
Available models
We offer a complete range of phosphorus removal options to meet your unique wastewater treatment needs. No matter the size of your project, no matter the environmental regulations in your area, we have a solution to help.

Polyethylene primary reactor.
- compact and lightweight
- pre-assembled
- polyethylene electrocoagulation unit

Concrete primary reactor.
- our strongest primary reactor
- made by local pre-casters
- pre-assembled
- polyethylene electrocoagulation unit

The ideal complement to Ecoflo and Rewatec treatment systems.
- tailored to suit your exact needs
- easy installation and low maintenance
- injects coagulant based on flow rates
Get a free quote
Contact our expert in your area for more information about the Rewatec phosphorus removal system that is right for you.