Chemicals for the treatment of wastewater; Chemical clarification preparations for treating wastewater; Flocculants for treating wastewater; Chemicals, namely, precipitants for treating wastewater; Chemicals, namely, coagulants for treating wastewater; Chemicals for treating digested sludge; Inorganic magnesium salt-based substances, namely inorganic salts, for phosphate precipitation and coagulation for treating wastewater; Chemicals for forming magnesium ammonium phosphates and colloidal co...