There are a bunch of u tubes that describe flushing , what I would guess are cell shorted automotive batteries with, baking soda/ water and then water. they then refill them with Epsom salts, trickle charge them and that seems to work, My question is since one has to drain the acid out anyway how about if one was to just flush the crap in the bottom out, figure a SAFE way to filter the acid and re install.