Thats it...i was reading all about some mush from Cheshire in the 1700,s who invented it i like the idea of using water to pump water rather than the easy way out with electric
i think id go with the submersible pump, that small cost will probs mean the job gets doner far quicker, but im positive when i was playing about with 1, the guy who owned it said lots of folk make them themselves, an they are easy to build an run, but as i said it was a long time ago