Those for Strainers, would claim that they prevent large particles from entering the pump via the suction pipe and anything large will almost certainly wreck the pump. A big piston pump could cost thousands of pounds.
Those against would say that strainers are 125micron and do not stop small particles. They also collect silt and fiberous material on the mesh which eventually blocks the strainer and damages the pump through cavitation. Strainers are located in the tank and owners are not always aware they exist. By the time they do, the pump can be wrecked.
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