update this paragraph to be clearer:
Manufacturers of soymilk and tofu products want a high PDI to ensure the maximum protein content in their products. Manufacturers of soy-based fish feed require a low PDI to avoid loss of valuable protein into the surrounding water.
Manufacturers of soymilk and tofu products want a high PDI to ensure the maximum protein content in their products. However, manufacturers of soy-based fish feed require a low PDI to avoid loss of valuable protein into the surrounding water.