My CH is 170. Before I bump it up to 250 I have a question. I'm not entirely happy with my StoneScapes pebble finish. I think it could have been worked longer to expose more aggregate leaving less plaster exposed. Would leaving the CH at 170 for a while allow for the plaster to wear away a bit? If so, how long should I keep the CH level at its current level? The pool is 6 months old.