How Does Live Phytoplankton Help Control Toxic Algae Blooms?

Live phytoplankton controls toxic algae blooms by consuming the nutrients that harmful algae need to survive. The limiting nutrient for cyanobacteria is phosphate however it will easily pull ammonia and nitrate from the water as well instead of the atmosphere. Live beneficial phytoplankton can starving toxic cyanobacteria of the resources required to grow. This process is called bioremediation through competitive nutrient consumption or competive exclusion. It is a natural, chemical-free alternative to algaecides that addresses the root cause (excess nutrients, particullary phosphate) of harmful algal blooms (HABs), not just the symptoms.

What Causes Toxic Algae Blooms?

Toxic algae blooms — most commonly caused by cyanobacteria (blue-green algae) and are triggered by excess nutrients in freshwater bodies. The most critical of these is phosphate (PO₄), which acts as the limiting nutrient for toxic algae. When phosphate is present in sufficient concentrations, cyanobacteria can bloom rapidly, some of which produce toxins that harm wildlife, close swimming areas, and create public health emergencies.

Excess nitrogen compounds like ammonia (NH₄) and nitrate (NO₃)  further fuel bloom development. These nutrients typically enter water bodies through agricultural runoff, stormwater, failing septic systems, and urban development, however cyanobacteria can also pull nitrogen from the atmosphere.

How Live Phytoplankton Outcompetes Toxic Algae

Beneficial phytoplankton and toxic cyanobacteria compete for the same nutrients. When a dense concentration of live, beneficial phytoplankton is introduced into a water body, it rapidly consumes available phosphate, ammonia, and nitrate whichdepletes the nutrient pool that toxic algae depends on.

This is competitive exclusion: beneficial organisms out-consume harmful ones for the same limited resources.

Hydralife Solutions' concentrated live phytoplankton delivers the following documented nutrient removal rates:

Nutrient	Uptake Rate	Removal Efficiency
Phosphate (PO₄)	0.5–10 mg per gram of biomass	70–90%
Ammonia (NH₄)	10–50 mg per gram of biomass	80–95%
Nitrate (NO₃)	10–40 mg per gram of biomass	50–80%+

By removing 70–90% of available phosphate alone early on, beneficial phytoplankton can prevent cyanobacteria from reaching bloom thresholds — and in active bloom conditions, it begins reversing the bloom by eliminating the nutrient supply sustaining it.

Why This Works Better Than Algaecides

Chemical algaecides kill algae. They do not remove the nutrients that caused the bloom. Once the algaecide dissipates, nutrients remain in the water and the bloom returns. This creates a cycle of repeated chemical treatment with no long-term resolution.

Live phytoplankton offers a different approach:

• Removes the root cause of cyanobacteria blooms. Beneficial phytoplankton consumes the excess nutrients that fuel toxic blooms

• Self-replicates. Phytoplankton continues working throughout the entire warm/grow season at daily growth rates of 21–54% when conditions and nutrients are right. It will taper off its growth as it establishes control.

• Improves ecosystem health. Beneficial phytoplakton increases dissolved oxygen, reduces CO₂, feeds zooplankton and minnows

• Requires no chemical permits . There is no regulatory burden and no ecological risk as good phytoplankton helps promote a healthy food chain.

• One application, lasting effect. Unlike algaecides, which require repeated treatments, phytoplankton reproduces and work 24/7.

  
  

How Live Phytoplankton Is Applied

Hydralife Solutions phytoplankton ships overnight in 5-gallon buckets of concentrated live product. Application is straightforward:

1. Temperature acclimate the bucket at the water's edge for around 30 minutes

2. Pour into the outflowing current of the water body

3. The phytoplankton inoculates the water and begins self-replicating and consuming nutrients immediately

No equipment. No permits. No chemicals.

Additional Ecosystem Benefits

Beyond nutrient removal, live phytoplankton improves the entire aquatic ecosystem:

• Increases dissolved oxygen. Good phytoplankton supports fish, beneficial bacteria, and the denitrification processes

• Reduces CO₂. Phytoplankton consumes carbon dioxide, helping prevent eutrophication

• Feeds the food chain. Zooplankton and minnows feed on phytoplankton, restoring biological balance and providing food for fish fry.

• Reduces muck accumulation. Improved oxygen levels support microbial breakdown of organic sediment.

  
  

Who Uses Live Phytoplankton for Algae Control?

Beneficial phytoplankton inoculation is applicable for:

• Municipal lakes and recreational water bodies managed by parks & recreation departments

• Private lakes and ponds managed by homeowner associations or landowners

• Agricultural irrigation ponds affected by fertilizer runoff

• Golf course ponds managing algae and nutrient loading

• Water bodies with chronic HAB histories requiring a long-term, chemical-free solution

The Bottom Line

Live phytoplankton controls toxic algae blooms by eliminating the nutrients that make blooms possible. With phosphate removal efficiency of 70–90% and ammonia removal of 80–95%, beneficial phytoplankton outcompetes cyanobacteria at the nutrient level providing a self-sustaining, ecosystem that chemical algaecides cannot match.

Hydralife Solutions produces concentrated live beneficial phytoplankton for freshwater bioremediation, shipped overnight to treatment sites across the United States.

📍 Based in Denver, Colorado | 🌐 www.hydralife.org | 📺 YouTube @HydralifeSolutions

Learn more about the science behind phytoplankton-based water quality solutions at hydralife.org/blog.

Healthy Lake with no HAB