The correction depends on why you have having negative pressure. If it is because the pipes are at a higher elevation than the surrounding tanks, you may need to pump over that high point. If it is because of excessive head loss,, you may need some larger pipes upstream of those negative pressures. A good way to check is to create a hydraulic profile between the source tank and the tank downstream of the problem area. You'll find that under View > Profiles > New.
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