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противоточная промывка stresses
automat.	backwash
construct.	counterflow rinse
el.	backflush
nat.res.	countercurrent rinsing; countercurrent rinse; countercurrent wash; countercurrent washing process
phys.	counter-current washing
tech.	countercurrent washing; back-washing
water.suppl.	backpulse (igisheva); backpulsing (igisheva)

противоточная промывка: 3 phrases in 3 subjects

Aluminium industry	1
Makarov	1
Wood processing	1