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This was unexpected. The channel at top left leads to the cave river. When it was opened, water jetted down it at very high speed and filled it right to the end in perhaps 30 seconds. After that, when it was going round the diagonal, the water pressure fell away completely and it took forever to fill the rest. Now there isn't enough water for the pump on the level above to be effective.
I guess plumbing should be done in straight lines. :( -
Ambivalence