THE results of testing on a mystery foam that swamped Lake Macquarie beaches on Sunday are due to be issued today. It is believed the foam, which was combined with a slimy slick, may have been caused by an algal bloom."We won't know what type of algae until we get the results back today from the Department of Environment and Climate Change," a Lake Macquarie Council spokeswoman said yesterday.The slick extended for about 500 metres along Blacksmiths Beach and forced the cancellation of a surfboat competition. The beach was closed but reopened yesterday. "If anyone is concerned about the foam they should not enter the water," the spokeswoman said.Terrigal Surf Lifesaving Club competitor Suz Gerrish said competitors were disgusted and feared the foam would interfere with a state surf lifesaving carnival planned for the beach in a few weeks."It was all slimy and covered the boats and the people who tried to go out in what looked like meringue," Mrs Gerrish said."You couldn't wash the slime off, I had to have three showers and I could still feel it . . . It was just disgusting."