I have listed an SGS Chlorine Generator for sale on ebay. I used for about one season as salt and my dogs medication for seizures did not mix well (Potassium Bromide was less effective after my dog drank salt pool water).
SGS 4000 is rated for 50,000 gallons.
here is the link!
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 720wt_1139