I've never posted on a forum about my starter, so I suppose this is a last ditch effort to revive my 10 year old sourdough starter.  Approximately 10 years ago, I purchased the original San Francisco sourdough starter from sourdo.com.  I activated it according to the instructions and have been using it several times a year ever since.  I'm not religious about taking it out of the refrigerator and feeding and on occassion have gone as long as six months.  However, after several feedings I am always able to bring it back to its originaly active state.  The most recent time I took it out to refresh it, however, I have been faced with much difficulty.  At first I was getting little to no activity even after several days.  I adjusted the feeding to a double feeding (approximately 2 cups of flour to 1 1/2 cups of water).  After a day or two, I started to see some signs of life.  This has now been going on for over a week.  The problem is that I'm not getting any increase in volume.  There is definately activity going on with plenty of bubbles, but the start never seems to increase in volume.  It used to be once I got the starter super-activated it would double in volume in just a few hours and spew over the top of the jar.  I use the same flour that I have always used - King Arthur bread flour.

Any help anyone can provide would be greatly appreciated.

Regards,

Edward