50k gallons => 10 ppm dose of dichlor => 8 - 9 lbs

1. Add a 10# (12 measuring cups -- not the little scoop in the bucked) dose to start. Broadcast it over the pool, but check the wind, and don't let the dust blow back on you, and especially, do not breath the dust!

2. Dichlor has little initial effect on the pH, but will lower it a lot as it breaks down. With no skimmer, I'm not sure how best to add it, but you should add a box of borax with every 10# of dichlor. On a pool that large, you'll need a lot of borax, so clean out the Walmart shelves when you find some there. If you can't get borax, you can use 1/2 box of washing soda for every box of borax . . . but you'll end up with higher alkalinity, and that *may* be an issue.

I put the photos on Picasa, but I'm not linking them in. You have a Hayward CL200 tab feeder -- which restricts flow tremendously and a PacFab (Pentair) Challenger II pump. Otherwise, the labels weren't readable. The motor label was very clear, but most of the data needed was below the camera. The Challenger labels appear to be readable, but the photo was out of focus.