Ive been growing in 5 gallon buckets ive got about 8 buckets and i want to revitalize the potting soil. I was going to dump it all out and mix some compost in but i dont know whats enough or too much. I bought 2 bags of natures care is that gonna be enough?

" ..., you can mix in one-part compost to three or four parts of your old potting soil. Besides adding nutrients that plants need, both the fresh potting soil and compost will help keep the mix from compacting."

Be careful with manure, they can be too hot for the plants. Maybe mix in very slowly is best.