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East Bay lake treatments, oxygenation dramatically cut toxins and kept beaches open in 2025
Summary
East Bay Regional Park District reported phosphorus‑binding treatments and an oxygenation system at Lake Anza and Lake Temescal reduced toxins and improved clarity, allowing swim beaches to remain open through the 2025 season for the first time in years.
Anya Bray, ecological services coordinator at East Bay Regional Park District, told CC Hub members that a 2025 pilot combining phosphorus‑binding treatments and an oxygenation saturation technology produced striking results at two small urban reservoirs.
"So before the treatment, the secchi depth was 1.6 meters. After the treatment, the depth that I could see the secchi depth doubled to 3.5, and then 12 days later, we even had 4.6 meters of clarity," Bray said, summarizing on‑the‑water monitoring after the aluminum‑based treatment and the oxygenation installation.
The park district tested ACH (aluminum chloride) at Lake Anza and a mix of ACH plus Foslox at…
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