Sago processing

In sago processing industries, settling tank is being used for getting pure starch by adding few chemicals to avoid browning reaction… My question is, is there any Technology or other equipment for getting pure starch without adding chemicals? That technology should be an affordable for small scale industries.

Or

What are the chemicals added in the sago processing industries as per regulations?

Do you have an idea? Pls share it. It will be very useful for us.