Yes, it was the customer support guy from Intex Corp that told me I could wait and see if I actually needed it. I hated to add extra chemicals that weren't needed, so that is why we didn't use it at first.

Once we added the CYA, we have had consistent levels (all good I think with the exception of a high alkalinity) for 2 weeks now. I guess I am a little confused. I looked at the best guess chart and to me it seems that my chlorine level of 3-5 seems right for a CYA of 20 and it stays at that level all day. Am I not looking at that right? Are the steps that you gave me to help lower my alkalinity?

Thanks!!