One of the best ways is to use dual media filter process.
Media filtration is a mechanical process used by waste water treatment plants in India.
Pre-treatment in RO process;
Pre-treatment in desalination process.
Different types of Filter Media are used depending on the raw water quality &
the treated water quality required.
It is also a low cost pre-treatment system for ion exchangers
(deionizer and softener) and membrane systems such as reverse osmosis etc.
.