Probably been asked before but what kind of sock should I be using to add granular CYA?

It doesn't matter a whole lot. Just about anything, from a stocking to a heavy wool sock, will work.

I used a cut up pair of my wife's old pantyhose. It worked great! Pretty funny filling the pantyhose with the 4 lb canister of cya. The little can holds quite a bit when it's put into the hose. It kept filling and filling until the panythose was nearly three feet long.

Used old tube socks (no holes)

Old tube sock here too. You'll be amazed at how pristine white it is once all the stabilizer is dissolved too

This is kind of weird but I recently bought a "Bra Bag" from my grocery store For this exact purpose. It cost about $5 and I found it when I was looking for some borax. It works great for this purpose - fill it up an it fits perfectly in my skimmer.

It has a zipper closure that seems to hold up well to chemicals and has 2 sides with fine or coarse mesh so you could control the release speed of the chemicals.

Link: http://www.amazon.com/gp/product/B004W5NU8I

Traveller... freaking genius... I hate adding all of the solid chems directly to my filter but I know I killed my last liner with solid chems on the floor of my AGP. I am either going to steal the one we have in the laundry room or pinch over to WM to get one for the skimmer basket. Now the kids won't play with it.

I just pour CYA directly into the skimmer. The only downside is you cant back wash for a few days. But I think it dissolves very quickly, probably within 24 hours with water constantly passing over every particle

The only problem with pouring directly into the skimmer (other than not being able to backwash) is we've had two cases recently where CYA has solidified in the piping partially blocking the flow and had to be chipped out. While we don't see that often, it can happen and people should be aware that it can.

When pouring into the skimmer, it is also possible for CYA to cause the pump to lose prime or break the pump skimmer basket if you pour too quickly (been there done both).