[USA] Indian Lake, closed all of last summer because of blue-green algae and multiple days this summer for algae treatments, will be closed again on Friday, August 21, for another copper sulfate treatment. The lake will re-open the next day.
A water sample collected August 10 showed blue-green algae cells at 27,000 per milliliter, according to the Indian Lake Watershed Association. Although that is below the 70,000 cells per milliliter that would trigger state restrictions on use, the ILWA has been trying to take a proactive approach when it comes to the algae, also known as cyanobacteria, which releases toxins when it blooms.
The copper treatment’s goal is to eradicate current algae blooming in the lake. A June 22 treatment had the same goal, using the same chemical. A May alum treatment was supposed to create a type of sealant at the bottom of the lake, as well as remove phosphorous, one of the main causes of blue-green algae.
The city of Worcester will pay for the treatment. The city has also paid for ongoing weekly testing of the lake. The ILWA paid for the previous two treatments this year – a total cost of $30,000 – with donated funds.
View original article at: Indian Lake will close August 21 for chemical algae treatment