FIELD: medical, food and electronic industries. SUBSTANCE: apparatus has body with covers and pipelines for delivery of water from water supply system and removal of concentrate and saltless water. Roll membrane element with filtrate removing tube is positioned in apparatus body. Separator is arranged inside roll membrane element between turns of membrane stack. Separator partitions form channels for working solution motion. Filtrate line of roll membrane element is divided into two sections by means of nontransparent partition. First section length is 0.6- 0.9 roll length from working solution inlet. EFFECT: improved design. 1 tbl, 2 dwg
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