As long as Cl` is still in pool it should be safe to swim. I am starting the same process on my neighbors pool. I am not dropping Cl` levels until we have all chemicals to start. We are actually going to add some Cl` tonight to make sure we do not another algae breakout. We have adjusted Ph down to 7.2 now.

Here is the process I will be following (post #11 and 12):
http://www.poolforum.com/pf2/showthread.php?15092

Pooldoc recommends putting the filter back in after the stains are scrubbed and sequestrating agent is in the water.

best of luck