OH MY..... I'm not really sure how to answer your question now. Ummmm, till it blows up? Sounds like you're at a crossroads to me, drive it till it blows and fix it as you go along, or bow out now. With salt water usage, and no real records, my first instinct is to bail. If you got a REALLY great deal, it might be worth keeping, but its a crap shoot now. Go with your gut feeling.