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From my experience (not much), suppliers usually only give you a K value to determine your pressure across the filter. This is a similar value to what suppliers will give with valves, elbows, and other components that will create a drop in pressure. That is, the K is to be used in the equation;
gH = KV2/2
Where;
g = gravity
H = pressure head
K = loss coefficient (given by supplier)
V = Velocity of the fluid
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