The last in the current series of community forums on the algal bloom will be held on Kangaroo Island on Thursday 28 August.

The forums have been held across the state over the past month to update local communities on the response to the natural disaster affecting beaches, tourism and industry along the coast.

Each forum features expert presentations on algal bloom science, public health advice and safety, and include an expert panel Q&A, with the opportunity to share insights and ask questions.

US expert on algal blooms Don Anderson visited the South Australia last week to address the state government taskforce on possible measures to combat the bloom.

One of them could be application of a modified clay that binds to phosphorus and forces algal cells to the sea floor, where they stop growing or die.

Environment Minister Susan Close told ABC radio the task force would look into trials of the clay, but federal approval was needed.

The algal bloom Karenia Mikimotoi was first detected on the south coast of the Fleurieu Peninsula in March and has since spread to Kangaroo Island, metropolitan beaches and the Yorke Peninsula.

It has caused foamy and discoloured water, with surfers and beachgoers suffering symptoms including coughing and breathing difficulties, itchy eyes and blurred vision.

It has affected about 400 types of fish and marine animals with dead creatures continuing to wash up on beaches across the state.

State and federal government have committed a $28 million support package towards research, clean-up efforts, community support, industry help and public information.

The Kangaroo Island forum will be held at Kingscote Campus - Performing Arts Centre from 6pm to 8pm. It is free to attend and open to the public, but registration is essential via Humanitix.