Three gallons of 6% bleach should take you to about 14 ppm on your 13,000 gal pool. Will probably be eaten up fast so check after a few hours and add as necessary. And yes, just dump it in the skimmer. With water circulating the concentrated stuff isn't in the equipment long enough to do any damage at all. There is a calculator from mwsmith2 that you can download. Do a search for any of his posts....the link to the calculator is in his signature. Simply...1 gallon of 6% in 10,000 gal raises the chlorine level 6 PPM.
Al
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