A pool without CYA isn't going to keep a chlorine reading. Even if you turn on your SWCG, you're not going to have enough chlorine to keep algae at bay. That is why you need to get your water balanced first and then turn on the unit.
You can use the conditioner. That is the right stuff. But, without knowing how high your unit needs the CYA to be, I'm not sure what amount to recommend that you add. Maybe aim for about 50ppm for now which would be around 2lbs. Put it in an old sock and hang it in front of a return jet. Give the sock a squeeze every now and then to help it dissolve faster.
In the meantime, maintain some chlorine in the pool with bleach.
It is ok to swim now.
(Turns out that I was wrong-- Dave doesn't have an Intex SWCG. Not sure why I though that.)
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