Quote Originally Posted by cygnusecks
Just pour slowly into skimmer. I dump a 4 lb. dose of CYA over the course of two minutes. CYA tends to clump, so don't dump it all in at once. Slowly pouring means it'll find its way to your filter and dissolve there. I think it would dissolve much faster evenly spread out over your filter, vs. in a big clump in a skimmer sock.
If you use this method (which is a perfectly fine method) do NOT back wash your filter for a week after all the crystals are gone. Otherwise a lot of CYA will be stuck in the filter and back-washed out!

Whenever I feel the need to raise my CYA I just start chlorinating with either Tri-Chlor pucks or Di-Chlor powder, whichever I have on hand.