Hi - such a fantastic concept & beautiful design! can you tell me the anticipated ongoing useage costs - for like a year if I use it every day for a home of 3 eating fresh fruit & veg every day. What will filter replacements cost / how often / and the starter sachets - how much do they cost and how often do I need to use them? Thanks - I really hope I can fit this in my budget …. Totally brilliant solution, thanks! :)