Thanks for all the replies
The tank has a filter right after it before it goes anywhere. Its a Culligan .2 micron or something, its the one that blocks everything, even chlorine. it know its an activated charcoal filter. its a PITA to change out, and I know I have to remove it before I flush the system. Otherwise I'll just flood the filter. Thanks a lot for all the help, I'm in Hampton roads and we have 4" of snow on the boat right now, so i am a bit more concerned with keeping warm( a baseboard heater and a forced air heater and very careful electrical management) hopefully I’ll be able to find enough hose to tackle this problem relatively soon. I do like drinking water without having to boil it.
One quick filter location, I figured putting it before everything in the system would work well to keep the entire lines free of contaminates, do you think its the new hoses that already had some contaminates on it that grew? or is there a place I should move the filter to or put another one?
Thanks for all your replies,