According to The Pool Calculator 37oz of dichlor will add 7ppm of FC and 6.4ppm CYA to your 22,000 gallon pool and drop the pH by 0.27. You may be able to use this dose of dichlor 4 or 5 more times before reaching your CYA goal.

I think you're going to need unstabilized chlorine - Bleach (Liquid Chlorine) or Cal-hypo to clean up. The pool is consuming chlorine too fast to reach and maintain shock level with just dichlor.

You'll also need Borax to raise pH after dichlor lowers it. I don't know why you get such a strange reading but dichlor should push pH down.

You'll also need "The Good Test Kit" the Taylor K-2006 (or K-2006C) available from the link in Watermom's Sig. It will let you eaisly measure the high chlorine levels you'll need (from Ben's Best Guess Chart) to finish off the algae in yourn pool.

Go ahead and add one more dose of dichlor if that's all you have on hand but don't use more without getting a reliable reading on your pH.