thanks Krave.i am trying to search the forums,its hard going!!can't even find what ro/ri means what it involves or how long process takes.one thing i have seen is that you seem to waste an aweful lot of water in the purification process,seems crazy to me,trad use a couple of buckets a day,wfp use hundreds of litres,the cost of production must be massive,especially on a metre,i would of thought being a business you would legally have to have a meter fitted.i am not knocking wfp as i am interested in it,but the waste just seems crazy