My 82 h27 has a pressure freshwater system that has not been used for about 10 years. I am going to try it out and once I am sure it works I would like to flush the lines and tank. I don't plan to use this for drinking but would like to have clean water for a cockpit hose or deck shower down the road. I plan to tie into the galley supply line and TEE off for the deck shower. Will the pump supply enough water for something like this? Any suggestions on what to use to flush it out?