When I first started, I thought go for the most powerful pump, you never know when you might need the delivery. After burning out 1 Shureflow & 1 Flojet ( after 2 weeks!) I'm now using a 35psi Flojet Quad Wash Down pump. (£26 off eBay). Luverly pump, flowrate just perfect. Really quiet & I'm sure I'm gonna get at least an extra day battery use. I use 90 metres of 6mm plasic hose. ( I'm told this is why the Flojet burnt out )
Kevin.