Thank you so much for replying!

Since my last post, I took a sample of water to the pool store. CYA and CL are 0 because I had to keep them out while using the Pool Magnet/Iron Away (sequestrants or chelators - not positive which). My PH was 7.3 and he said everything else was 'in check'. My iron was at 0.5 (and I was so excited)! He suggested I shock. I took a bucket of water from the pool and added (probably too much) shock - it's cloudy white right now and I won't shock the pool if it remains that way over the next hour. I'd rather lose a bucket of pool water rather than start from scratch and adding another $120 of Pool Magnet because I shocked the pool before it's ready.

He also told me once my iron was inactive completely, I wouldn't have to maintain with Pool Magnet (but I'm learning through this forum that pool stores can't be trusted) - unless I add more iron-laden water - but I learned my lesson (as usual, the hard way) and bought a prefilter.