Coagulants are used for stabile colloids destrcution. Normally stabile colloids have negative charge and particles pusching against each other.
Coagulants make destrcution of stabile colloids and form microparticles. Using flocculants these particles are gathered to big complexes and can be removed mechanically.
Coagulants can be organic and non-organic.
Photo shows samples without coagulant and with coagulant:
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