I have only used reverse osmosis water and am about to start flushing and was wondering if I need to use RO water for the flush. I have only ever given it the reverse osmosis and was thinking it was needed to continue but don't have a system and have been filling the water up at the water store so I was wondering if I could cheat with using tap water for the flush but thought that could be the crucial time for RO water. Any assistance is much appreciated. Thank you in advance