If your going to refill, I'd say no need to start the circulation system. How are you going to drain?
It's gonna be gross but you'll have to get all the debris out before refilling. I'd wash it down pretty good with strong bleach solution as well.
You can tie lines to the top rail and stake them out (like a tent) to help keep the wall from collapsing.
This might be a good time to switch to chlorine. Read about the "BBB" method we tech here at poolsolutions.com and in the stickies in the forums here (you'll have to log out to see the rest of the forum).
Good luck, let us know how you're doing (and when you make the decision to switch to chlorine).
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