Drain pool or add 77 lbs of shock - other options?

[Barbsite]

I ordered and received the dichlor from Amazon: Kem-Tek Dichlor 22 lbs. How do I add this - a little each day or a lot initially or ?

We also purchased new large and medium filters. The medium filter has arrived but the large filter is estimated to be delivered next week. I had cleaned our existing filter with a special soap purchased from the pool store about a month ago, but we decided that the filters probably needed replacing, possibly because last year my husband used a power washer on them. Regardless of the reason, the filters don't seem to be working well.

[PoolDoc]

2 lbs (4 cups) at a time will add 5 ppm chlorine doses to your pool, and 4 ppm CYA doses. Just use the dichlor to add chlorine.

Power washers will definitely destroy cartridges. You don't need a special soap; the cartridge makers all recommend TSP. Full instructions here:
http://www.poolforum.com/pf2/showthr...ut-Damaging-It!