I went to the pool store to pick up some CYA. I told them that I tested my CYA and it was showing up less than 30 ppm. Pool guy remembered that they had just tested my water a few days ago and got defensive. He told me that my test couldn't have been as accurate as theirs was and I must be wrong. He was trying to sell me a $45 bottle of "conditioner" which was 30% CYA. He didn't seem thrilled when I was looking at ingredients and even less thrilled when I put it back and picked up the $25 bucket of CYA. I added 27 ounces by weight in old panty hose in front of a return. I know that is not a lot, but like I have read in previous threads, this is something that I want to sneak up on, not over shoot. Thank you for all of your help! Kids are so excited to get in the pool for the first time this season!