There were made an investigation onto the use of a mesh filter of the size 100 Mesh in the installation, in which the liquid containing entomopathogenic nematodes Steinernema feltiae flowed repeatedely. The fluid flow was 20 dm3 ?min-1. Average concentration of the nematodes in 1 ml of liquid amounted 900 items. The liquid flowed through the installation form 4 to 32,5 times. The nematode losses was not noticed.
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