Thanks Ben. I've ordered the kit, but it looks like it will be a couple days. To answer your post:

1. I just now sent the pics you requested, so hopefully they are there. And nope, pool hasn't been green and slimy at all since the cartridges were clean. That said, I think there may have been one time that it got slightly more dirty than usual, but it cleared up...can't recall if that was right before the cartridge change, or after.

2. I don't have any shock powder on hand...so if you had one you wanted to recommend (that I could possibly pick up locally), let me know and I'll get it. When you say 'until we have test readings', do you mean like the ones I've been posting the last couple days? Or, do you mean a reading once I have a better kit?