JCO, times are getting sad. Went into my local Lowes store and looked around and could not find any rock wool. So I went to a clerk in the deptment and asked. "What's that" is the response that I got. She found the other person in the deptment and asked her and she had no clue either. Home I went and on to Amazon I went and made my order. Good thing I'm a prime member and get cheap, fast delivery.