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If the pump is pushing substantial flow at 20m,put a clear hose and hoist it up a tree. I am almost certain you will get your 6m plus though with reduced flow. Your drive head is too good to have head issues at 26m even with a crude hydram if its pumping to 20m. If it works with the hose check your delivery pipe again. I have experienced this several times and no matter how I twicked the hydram it seemed to always not do the "last mile". I have been fabricating and installing since 2000 using the DTU model and I am unable to stop myself.