The initial alum treatment has been applied to Grand Lake St. Marys with positive results.  Highlights of the treatment include:

  • Alum (aluminum sulfate) binds with phosphorous and causes it to sink to the lake bottom, thus starving blue-green algae of its food source.
  • Five sites were scheduled to receive the treatment, but two were scrapped due to shallow water.
  • It took approximately 90 minutes for the alum to bind with the phosphorous and sink to the bottom.  Water clarity improved, in some areas to a depth of 4.5 feet.
  • Water at each site will be tested over the next 60 days to determine how effective the treatment is in reducing blue-green algae.
  • If the treatment is deemed a success, a whole-lake application could be scheduled at an estimated cost of $10 million.

READ THE FULL STORY from the Daily Standard.