I sanitize my system at the start of every trip. Secondly I try to be careful about the source of water. I use municipal or other treated and tested sources. Of course, I mostly assume proper treatment and testing. When in doubt, I sometimes ask. Finally for drinking, I use water filtered through a Britta or similar water jug. In 7 years, I have never had any issues nor have I ever seen an accumulation of sediment or scale.