Struvite was crystallized from the title soln. to det. the kinetic parameters of the ideal mixed suspension, mixed product removal MSMPR model. Rojkowski exponential size-dependent growth model was used for the calculation. Nuclei population d., their growth rates, and crystal linear growth rates were detd. from product crystal size distributions. At Al-3(+) or Fe3+ contents 10-100 mg/kg or 2-10 mg/kg, resp., in the soln. feeding the crystallizer, pH 9 or 11 and the mean residence time of suspension in the crystallizer tau 900 or 3600 s, the linear growth rate of struvite crystals in presence of Al-3(+) varied from 6.82.10(-9) to 1.90.10(-8) m/s, whereas in presence of Fe3+ it was within the 6.1640(-9)-1.4940(-8) m/s range. Nucleation rate varied within the 2.89-10(12)-1.98-10(15) 1/(s.m(3)) and 4.30.10(14)-1.61.10(16) 1/(s.m(3)), resp. Al-3(+) ions affected struvite reaction crystn. more advantageously than Fe3+ ions. The MSMPR model test results were compared with the kinetic data of struvite crystallization from real wastewater from the P fertilizer industry.