Hi, have a little SeaRay, a '12 260 SunDeck. I'm down in south FL and am a seasonal owner but get down there throughout the year every 6 weeks or so. Not sure how to handle the 20 gallons of freshwater storage the boat has. How long can I leave water in the tank between usage? BTW, I put about 60 hours/year on the boat. Should I pump it out every time I leave or with an ounce or two of bleach, can I leave the tank filled between visits down there? I've been pumping it dry every time I leave but if I could know that the water could be kept on board for an extended period of time, that would be helpful. I normally spend 2-3 months there in the winter so the questions is valid for that time period also. Basically the question is how long should a boat owner keep freshwater in their boat without either treating it or dumping it and replacing it. Appreciate all advice even though I expect there will be a range of opinions!