EDIT: Disjoint topics were merged by the admins into this single project ... so I apologize for the multiple questions in a single thread.
I hope it's not too confusing for you. It's a single project - but the questions are unrelated.
Q: What would you do to this pool once drained and before re-filling?
Due to a green pool, I decided to drain it:
picture relocated due to captions
The first question was whether draining causes detrimental effects on vegetation downhill
http://www3.picturepush.com/photo/a/...ue to captions
The second question is what to do with this (now empty) pool before filling it up?