For those that purify there water on demand with di bottles on the van . Where do the bottles go . ? Are they better before the pump or after the pump . I have always purified the water straight into the van tank . Occasionally putting hot water through them on cold winter mornings . I have hot and cold outside taps . Therefore having pure warm water in the tank . The main problem is the pure water that does not get used that day is iether left in the tank and is cold the next day or is drained and wasted . So I am wanting to blast the hot water straight in the tank just before I leave for work . And purifying as I go . I also fill a trolley straight from the tank outlet. With a hoselock splitter before the pump . Obviously I won't be able to do that . So will I still be able to use the splitter obviously after the di bottles . Any advice thanks .