Just visited the local pool store I used to frequent almost weekly during swim season until I discovered TFP.com last year
I had to pick up some Metal Magic.
Had been over a year since my last visit to the store.
They had installed brand new fancy automatic sliding doors and granite countertops throughout the store.
Can't tell you how elated I was to not have contributed to the funding of this new remodel (!)
Was discussing my water chemistry with the counter person with relation to metals/Metal Magic use - and, she must have mentioned the word "shock" eight times.
Certainly ecstatic to be free of the pool store shackles forever!!