Starter won't double itself
I am trying to nurse my sick starter back to health and not getting the results I want. About 10 days ago I started a vigorous attempt to revive my barely living starter. I have been using 1/4 c. of starter, 3/4 c. flour and 1/2 c. water. I let it sit out for 12 hours and then refridgerate it for the next 12 hours. I then repeat the process day after day. The starter has progressed some. 12 hours after feeding it has not doubled but has risen maybe half it's size. It usually has very vigorous bubbles on the surface and 1/4 of the way down but not throughout. What can I try to get it to double. Any sugguestions?