Activities on Lake Mamanasco in Ridgefield will be restricted for 24 hours because of a chemical treatment.  The Ridgefield Press reports that an algicide, SeClear, is being used in half of the lake today.  Swimming, drinking, fishing, irrigation, livestock watering is prohibited for a full day after treatment.  Boating is not restricted.  The Press reports that "The Pond and Lake Connection" has to wait 14 days in-between treatments, noting that this is the 7th treatment.  This is the second year that "The Pond and Lake Connection" is managing Mamanasco water quality.