After removal of our 20 year old Kenmore chemical iron filter, we installed the Aqua-cera unit. With a little guidance things went well and we are still able to control our iron. Also we eliminated a taste and smell. Now, we have some questions: First- our old filter had a vacation mode, What should we do when leave for a few days and we shut down water supply? By-pas or what? Second- With high iron, the venturi will have to cleaned. Can we have access to the venturi while in service or do we have to completely de-pressurize the unit. Third- Our water use is minimal, so is there an easy way to switch from a 2-day to a 3-day cycle? Thank you. The results have been positive so far. Have a great day.