I'm thinking of putting water storage or bins for the shower and water supply.My GF has someone who wants to put 2 bins,one for storage and one for use.I don't understand plus a pump.It seem excessive for small house.He wants about 15000 for total job does that sound right.I would think one bin,above ground, and pump would be enough.Unfortuately she already talk to man and she would lose face if I go with some one else.But I could get man to do what I want if I knew more about subject.