I never run my 100psi pump on full and saw some 30psi pumps on eBay. http://www.ebay.co.uk/itm/CARAVAN-MARINE-SHURFLO-WATER-PUMP-7-l-min-30-psi-12V-/170860439608?pt=UK_Campervan_Caravan_Accessories&hash=item27c8136838 Question is.. Would they work with a 100m hose like the 100psi does? What pressure do you think you run your current pump at? If this would work it would elimate the need for a flow controler just on off. What's your thoughts?