Like in modern medicine, your are treating the syptoms, not the cause. Don't blame the water for this, it's your fault. Take responsibilty of your safety! That like saying guns kill people, you know, people kill people! It sound like she suffers from years of neglect and abuse with no maintenance or maybe you just left the plugs out, I don't know. Anyway, take the hulls off, go over them, find the holes, go over her entirely, repair, refinish! works every time. this is cheap, but labor entensive but if you have enough time to go sailing you have enough time for this!