Did you buy a Juicer or a blender?  Juicer wouldn't really help, they basically extract the sugar waste and throw away the pulp which contains the bulk of the vitamins and minerals.   The juices tend to be sweet (as packed with sugar) which feeds the bad bacteria...so basically the opposite of what you want to happen.

Blender is better.  it keeps the nutrient rich pulp and can be more vegetable based so not as high in sugar, but the pulp can be quite fiberous, and encourages bowel movements in people with colons, so for us the effects can be quite strong.

I believe blending veg is good anti inflammatory for the bowel and would help keep pouchitis away, but you would get more bathroom visits due to teh fibre and not sure if it would help existing pouchitis.

personally im a blender and it has its uses..but has sideaffects too

I have heard amazing things about juicing cabbage. I bought my juicer and plan to start. Learned of this from another J-pouch group member

That reminds me that I need to make some carrot/celery juice, which makes my spleen so happy.  I also save the pulp and put it in chicken soup or some other food.  The pulp is great.  My guts prefer it to be cooked.  When I have items cooked with veggie pulp from my juicing, I have better poops.  I'm not sure about juicing for pouchitis.  I'm more of a preventative type person.  When I feel the inflammation and have the night seeps, I take some oregano oil (in capsules) and some probiotics and try to rest.  It always goes away.