Phytoplankton FAQs: Harmful Algal Bloom Treatment and Water Quality Questions

Across every documented project, nutrient levels fell and stayed down. At Ravenna Country Club in Colorado, ammonia dropped from 1.0 ppm to under 0.25 ppm and phosphate fell from 0.25 to 0.5 ppm down to barely detectable. At Lily Pond in Denver's Washington Park, all measured nutrients reached near zero and the pond held there through the summer. At Denver's City Park Golf irrigation pond, ammonia and phosphate both reached zero. Harmful algal blooms were prevented or neutralized, nuisance algae did not return, dissolved oxygen rose, and the treated waters became more productive, with large increases in daphnia, fish fry, fingerlings, and crustaceans.

Yes. Nutrient rich water is where Hydralife works best, because those nutrients are what our phytoplankton feeds on. It takes up ammonia, nitrite, nitrate, and phosphate directly from the water column and turns them into living cells, which starves toxic cyanobacteria and nuisance algae of what they need to bloom. Most of our accounts have nutrients entering their water, whether from a wastewater treatment facility, fertilizer runoff, or a nutrient bearing spring or inflow. In every water body we have treated, our phytoplankton has kept up with that incoming load and reduced nutrient levels. It also feeds the lake, building vibrant populations of zooplankton, fish fry, and other reproductive species.

Weeks, not months, when water is warm and sunny. At Denver's City Park Golf irrigation pond, ammonia went from 0.5 ppm to 0 ppm and phosphate from 0.5 ppm to 0 ppm by the first follow up test, eighteen days after the first application. At Lily Pond in Washington Park, nutrients were barely detectable three weeks after a 100 gallon inoculation. At Ravenna Country Club, ammonia dropped from 1.0 ppm to 0.25 ppm within two weeks of the first inoculation, and phosphate was barely detectable nine days after the main 100 gallon application in June. Cool, cloudy, or wet stretches slow phytoplankton growth and slow the drawdown with it.

Yes. Lily Pond in Denver's Washington Park is a children's fishing pond that carried a posted cyanobacteria advisory in May 2026 telling visitors and pets to stay out of the water. Denver Parks and Recreation gave Hydralife the opportunity to address the nutrients feeding it. After a 100 gallon inoculation on May 22, nutrients fell to near undetectable levels and Denver's Lake Manager reported that the advisory was lifted. The pond had no further cyanobacteria advisories for the rest of the season.

Not in the water bodies we have treated and monitored. The Ravenna Country Club irrigation pond went a full season with no surface filamentous algae, which the club's superintendent reported was the first time in his six years managing that water. Every untreated pond on the same property continued to carry surface nuisance algae through the same season. Because the phytoplankton holds nutrient levels below bloom thresholds instead of killing algae and releasing those nutrients back into the water, there is no dead biomass left behind to feed the next bloom.

An established phytoplankton population reproduces itself, so one application can carry a pond through a season. A private one million gallon pond in Albany, Ohio received a single 25 gallon spring inoculation on April 4, 2026. A test on July 20, more than three months later, read zero ammonia, zero nitrite, zero nitrate, and zero phosphate. Phosphate that started the season at 0.5 ppm had been fully consumed.

Yes, and that is the condition Hydralife is built for. The Ravenna Country Club pond irrigates roughly 380,000 gallons a night and refills with wastewater treatment effluent, and it still held ammonia and phosphate under 0.25 ppm through the season. At Denver's City Park Golf pond, the incoming effluent tested at 0.5 to 1.0 ppm ammonia while the treated pond held at 0.25 ppm. In Albany, Ohio, the spring feeding the pond carried 0.25 ppm ammonia and 5 ppm nitrate while the pond itself read zero for both. The phytoplankton consumes the nutrients as fast as they arrive.

Yes. On July 14, 2026, Brookside Laboratories analyzed water from the Ravenna Country Club irrigation pond. The independent ammonia, nitrate, and phosphate values matched Hydralife's field readings, giving third party confirmation of the nutrient reduction.

Ravenna is a platinum rated country club near Littleton and Castle Rock, Colorado. Its Hole 6 irrigation pond is refilled with effluent from two wastewater treatment facilities and irrigates roughly 380,000 gallons a night. After a 100 gallon inoculation of concentrated phytoplankton in June 2026, ammonia fell from 1.0 ppm to under 0.25 ppm and phosphate fell from 0.25 to 0.5 ppm down to barely detectable, and both held there through the season. The pond went the full summer with no surface filamentous algae, which the superintendent reported was the first time in his six years managing it. The club reduced pond maintenance spending by 80 percent, with a significant reduction in labor.

City Park Golf Course is a historic municipal course operated by the City and County of Denver. Its irrigation pond is fed by a large wastewater treatment facility and pumps more than 500,000 gallons a night. After the first inoculation in July 2024, ammonia went from 0.5 ppm to 0 ppm and phosphate from 0.5 ppm to 0 ppm, and the water cleared along the shoreline. The incoming effluent kept testing at 0.5 to 1.0 ppm ammonia while the treated pond held at 0.25 ppm, which showed the phytoplankton was consuming nutrients as fast as they arrived. The course grounds were disturbed in a 2017 reconstruction, so the treated irrigation water also delivers living phytoplankton back to the soil with every watering.

Yes. Phytoplankton is the base of the freshwater food web, so feeding the base feeds everything above it. The Ravenna Country Club pond produced a large daphnia bloom across the entire shoreline and the resident grass carp became more active and visible along the bank. At Lily Pond in Denver's Washington Park, a single short stretch of shoreline showed three different types of fish fry and fingerlings plus a baby crawfish. Dissolved oxygen also rises as the phytoplankton photosynthesizes, which supports fish through the hottest part of the summer.

Yes. Lily Pond in Denver's Washington Park is a designated children's fishing pond managed by Denver Parks and Recreation, and it was treated with Hydralife phytoplankton during the 2026 season. Hydralife uses no copper, no peroxide, and no algaecides of any kind, so there is no chemical residue and no dead algae decay to manage. The pond went from a posted toxic algae advisory to safe, clear, and visibly productive water.

Yes. Hydralife ships concentrated live phytoplankton nationwide, Monday through Thursday, on the delivery date you choose. Orders are concentrated in our centrifuge and packed with an air pump and airstone so the culture arrives alive and ready to apply. A private one million gallon pond in Albany, Ohio has now run two full seasons on shipped concentrate and held at zero ammonia, nitrate, and phosphate. We also ship to the east coast, including a pond in Manorville, New York that was inoculated with 100 gallons of concentrate in July 2026.