[Samgray]

I saved the pulp from last years cider brew and attempted to make cider vinegar, I started off strong stirring often, then filtered the pulp out. Since then I really haven’t touched it. Today I’ve attempted to dump in thinking surely 9 months should have done the trick, there is a good layer on top but the vinegar still only has a PH of 5 and tastes very cidery. Any clues as to why this might be? Surely it should be done by now? Any help massively welcome.