Curious how often everyone swaps out the water in their pipes. I recognize some pieces require more frequent changing so you can choose up to two options in the poll. I find myself dumping the water every morning and a quick ISO swish to knock out any residue (and a hot water rinse). If I don't have time for the ISO, I will hot water rinse my piece and let it dry before next use. I like and appreciate really clean glass - though I have some admiration for those who can go extended periods with dirty glass.