You can see a video of his process below. The experimentation started with fish tank clarifier, which is — apparently — mostly alum. Alum’s been used to treat wastewater for a long time.

You can see a video of his process below. The experimentation started with fish tank clarifier, which is — apparently — mostly alum. Alum’s been used to treat wastewater for a long time.

In an Instagram video posted Friday morning, Ullman said there is a “Plan B” if the aluminum sulfate treatment (alum) treatment does not sufficiently reduce the sediment at the North Fork ...