I am hoping someone can help. I have a koi pond with three sheer descent waterfalls . The first waterfall does not send and even flow, but rather is uneven. The middle waterfall operates properly regardless of whethher the pump speed is reduced. The third waterfall gets low or no water even if the speed of the pump is increased or uneven flow if the ball valves to the other waterfalls are turned off or the flow is reduced. . I have a hayward variable speed pump currently set at 2700 The pump is used to filter the water and send water back through the waterfalls, there are no other returns to the pond other than the waterfalls. The pond has a 3" bottom drain as well as a 2" skimmer line. From the filter the plumbing is 2" and reduced to 1 1/2. and thereafter split to the three lines going to the waterfalls with each having a ball valve to balance the flow of each. Wondering if this should be plumbed differently than depicted in the photo, or whether 2" pipe should be used for the furthest waterfall or whether there are too many 90 degree fittings in the line causing an issue? The filter that is depicted in the photo is a bead filter which has been backwashed and cleaned. Thank you to anyone that can help.
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