Beneficial Phytoplankton, Proven in the Field: Measured Results From Real Ponds and Lakes

A fair question comes up whenever a water treatment method is new: is it actually proven, or is it just a good idea? For Hydralife's beneficial phytoplankton, the answer is written in the water chemistry of real ponds and lakes. This is our field record: named clients, baselines and follow up nutrient readings, independent laboratory confirmation, and outcomes documented across a full growing season. The results below come from municipal park lakes, golf course irrigation ponds, and private ponds in Colorado, Ohio, and New York. Our approach is showing real results and we would like to be of assistance to more lake managers and bodies of water.

How the method works

Hydralife produces live concentrated beneficial phytoplankton that lowers nitrogen and phosphorus in ponds, lakes, and reservoirs. Every species we grow is chosen against the same criteria: high nutrient uptake, common presence in United States freshwater, excellent food source for zooplankton, they improve dissolved oxygen levels, they all utilize luxury uptake (the ability to consume and store more phosphate than they need to grow, they have high daily growth rates when the conditions are right and they live in a subtropical temperature range which causes the population to crash on its own as water cools and daylight drops. These are ordinary freshwater green algae of the kind already found in lakes and ponds across the country. Our photobioreactor lets us isolate species and build regional combinations, so a treatment can be matched to what already lives in the target water rather than introduced to it. This approach uses no copper or peroxide algaecides, and self propagates once established throughout the entire grow season. It is built for nutrient rich or problematic water. Hydralife simply gives a lake a boost of beneficial phytoplankton (good algae) which competes with bad algae for nutrients.

How to read the numbers

Every value below is in parts per million (ppm), measured on site with a freshwater test kit and, in one case, confirmed by an independent laboratory. Ammonia (NH4) is the most toxic nitrogen form and a primary food for the phytoplankton. Phosphate (PO4) is the nutrient most closely tied to harmful algal blooms. When a pond is fed by an inflow, the clearest proof is the gap between the nutrient rich water coming in and the far cleaner water in the pond, which shows the phytoplankton consuming nutrients as fast as they arrive.

Ravenna Country Club: a platinum club with lab-verified results

At Ravenna Country Club near Littleton, Colorado, the Hole 6 irrigation pond is refilled each night with roughly 380,000 gallons of nutrient rich effluent from two Castle Rock treatment facilities. After a single 100 gallon inoculation of concentrated phytoplankton, ammonia fell from 1.0 ppm to under 0.25 ppm, and phosphate dropped to a barely detectable level and held there through the season. For the first time in six years, the superintendent observed no surface filamentous algae on the pond. In July 2026, Brookside Laboratories independently confirmed the ammonia, nitrate, and phosphate results, and the club reported cutting pond maintenance spending by about 80 percent.

The pond that you treated looks great. No algae pressure with the heat, and in years past we would have seen some pressure by now.

Director of Agronomy and Superintendent, Ravenna Country Club, June 2026

Lily Pond: a lifted cyanobacteria advisory

Lily Pond is a children's fishing pond in Denver's Washington Park that carried a posted public health advisory for toxic algae in mid May 2026. Denver's Lake Manager, who has run the city's Lake Management Program for nearly three decades, selected it because it runs hot with cyanobacteria. After a 100 gallon inoculation, nutrients fell to near undetectable by early June and held there all summer. By late June the Lake Manager confirmed the cyanobacteria was no longer toxic, the advisory was lifted, and the pond did not post another advisory for the rest of the season.

We only have a visual inspection of the cyanobacteria and whether it is toxic. It is not toxic, so it has been at least neutralized.

Lake Manager, Denver Parks and Recreation, June 2026

City Park Golf: near zero in under two weeks

City Park Golf Course, a historic City and County of Denver municipal course, draws more than 500,000 gallons a night from a roughly twelve foot deep effluent fed irrigation pond. The pond had been managed with copper and a diatom fertilizer, and the City's Director of Agronomy and Head Superintendent wanted to try a natural approach. Beginning in July 2024, Hydralife removed 100 to 150 pounds of nuisance seaweed and applied about 100 gallons of concentrated phytoplankton alongside aeration. Within about two weeks, ammonia and phosphate had both fallen to zero and the water was noticeably clearer, holding that condition even as the effluent inflow kept carrying ammonia at 0.5 to 1.0 ppm.

Garfield Lake Park: an active municipal treatment

At Garfield Lake Park in Denver, treatment began in July 2026 on warm, murky, high nutrient water. In the opening weeks, after more than 400 gallons of concentrate, ammonia was roughly halved and nitrate fell from 5 ppm to zero. This account is active, and the numbers continue to develop through the season.

A private pond in Ohio: held at zero for months

A newly constructed, spring fed pond of more than one million gallons in Albany, Ohio was Hydralife's first out of state project, shipped as centrifuged live concentrate with aeration for the trip. In 2025 the pond held at zero ammonia and nitrate even as the spring fed measurable nutrients into it. In 2026, a single 25 gallon spring inoculation held the pond at zero ammonia, nitrite, nitrate, and phosphate for more than three months, with phosphate fully consumed from a 0.5 ppm start. The owner reported clear water and a pond full of life.

When I was there a few weeks ago the water was a ton clearer, and so far it appears to stay that way. No yucky stuff on the surface at all. And there are so many living things in the pond. Bugs, frogs, tadpoles, and a turtle.

Pond owner, Albany, Ohio, July 2025

What the field record shows

Read together, these accounts answer the question of whether beneficial phytoplankton works. The method has driven ammonia and phosphate down on effluent fed irrigation ponds, lifted a municipal cyanobacteria advisory on a public children's pond, and held a private pond at zero nutrients for months. The clients are named and institutional: a platinum rated country club, the City and County of Denver, and Denver Parks and Recreation. The results are measured against baselines, tracked across a full season, and in Ravenna's case confirmed by an independent laboratory. What holds across every water body is the same direction of travel: ammonia and phosphate down, nuisance and harmful algae suppressed, and water returned to a living, safer condition, with no copper or peroxide.

A note on method

Hydralife manages water biologically. Chemical controls work by killing algae, which returns the dead cells and their nutrient load to the water to feed the next bloom. Beneficial phytoplankton works the other way, by outcompeting nuisance growth for the nutrients it needs to live. It is a different category of solution, engineered for the high nutrient waters where chemical programs tend to struggle. Field readings vary with weather and irrigation, so the trend across a season, not any single reading, is the measure of the work.

Add your water body to the record

We are expanding this field program and documenting more water bodies across more regions, and we are looking for ponds, lakes, and irrigation sources to add to the record. If you manage a high nutrient pond, a golf course irrigation source, an HOA lake, or a municipal water body with a history of nuisance or harmful algae, we would like to test and document results on your water. The larger the sample, the stronger the proof, for your site and for the field. To discuss your water body or join the program, contact Hydralife Solutions at www.hydralife.org.