It may be necessary to decrease spray nozzle pressures to determine whether spray nozzles are clogged. This can be done on the upper and lower spray manifolds by turning the ball valve in the system rear cabinet which corresponds to the spray manifold for that section, in a counterclockwise direction until minimal spray nozzle flow is observed. With the pressure decreased, a clogged nozzle in the spray manifolds will have a noticeably diminished flow, compared to those which are not clogged.
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