As part of measures to improve the quality of the finished product - zinc sulfate, an additional stage of purification filtration using a newly installed filter press was introduced into the technological scheme of synthesis. Filter press Ritterhaus&Blecher Gmbh (Germany) has a filtration area of 60 m2, equipped with polypropylene plates 1000x1000 mm with a set of filter cloths, the maximum pressure of the feed pump is 15 bar. The pre-commissioning works showed a high degree of purification of zinc sulfate solutions before crystallization and extraction of the finished product. The introduction of new equipment made it possible to produce only the highest quality product in the current month. Our company strives to produce only high-quality products to meet the needs of customers, this approach will ensure the competitiveness of zinc sulfate produced by Promkhimperm LLC"