My pool project was completed yesterday. The last guys that the pool store sent were the cleaning crew/start up crew. The vacuumed pool and put the salt in. They also threw a bunch of shock in. They told me not to start the salt water generator for 48 hrs. They have me 2 buckets of what I think is CYA in the shape of a cylinder. They told me to put 2 at a time in the skimmer until I've used 10. I read on here all the time that cya should be put in a sock and put in front of a return. So is this guy incorrect or is this a different product ?