Did they even wash it off with water? That stuff is going to ruin the grass around the decking on top of everything else 
Wow, that is encouraging. I needed this message about a month ago! LOLMy concrete looked like that and it went away in the summer. I think it will go away.
Be careful not to add too much. It goes in easier than it comes out!My PB is coming on Monday to get all of my equipment up snd running. Should I add my salt beforehand? I’ve read on here to add it in the shallow end and work it around with the brush. I only got the Taylor salt strips when I ordered my TF-100 test kit.