Sorry about the cartridge info -- I mixed up your cloudy water with someone else's.

That orange = 20 ppm chlorine. Since you have 20ppm TC with THAT water, I'm guessing you have high CYA. You don't have any idea what it is, do you? I'm reluctant to tell you to add more chlorine, until I know, since you could end up bleaching your liner if the CYA is low.

For now, go ahead and use those Aquachem Shock Xtra blue -- it's dichlor + borax + a little copper. The copper will be gone before this mess is cleaned up, and the dichlor adds CYA, so it's a safer way to chlorinate, till we know your CYA level. Put it ALL in. (3lbs, you said?). Go ahead and put your Aquachem tabs in the skimmer, too.