I have installed a 10 000 litre tank & thought that I could get away with gravity to get the H2O where I wanted it. It kinda does, but I think it's time to hook a pump into the system, Only going to use for the garden & maybe to supply water to a large evaporative cooler that cools the shed. It's a long skinny block 60m x 20m on a bit of a slope. I have run 1 1/2" poly from to tank (which is up the back & on the highest part of the block) down along the backyard & house to the front yard. I want to install an automatic pump that will cope with the aircon float valve & power 4 taps for the garden. My question is - do I need a pump with a pressure tank? DAB pumps have some pretty good deals on at the moment but I'm finding the range a little confusing. Are there any pump gurus out there that can advise?