Hi all, I am in the middle of a pool re-fill because I had to get rid of some water due to high CYA and algae growth... so before I started a shock/slam I wanted to get rid of some CYA so I could use less bleach. Anyways, the point... if I have the pump pulling from the main drain and the skimmer closed, can I start to circulate with the return jets above the water level, or is it best practice to wait?