I've been using Japanese water stones for a long time on knives and wood-plane blades and always let them air dry between uses. Recently, after using splash-and-play Naniwa stones for a while, I went back to some older stones (King brand) and wondered if I could store them in a container of water so they're always ready to use. Does anyone do that? Do you have to use a weak chlorine solution to keep it from being smelly after a while? Does it hurt the stones?