Hi all. Brand new user and new pool owner. Briefly, we have a new in-ground cement pool with attached spa. It was filled 3 weeks ago. I wasn’t too happy with the exterior tile job on the spa but living with it. But today we noticed the grout on the outside of the spa (it’s white) is becoming discolored and cracking and falling out. All the way around the spa there’s rust seeping out from the grout lines. As I noted the tile job on the spa is pretty lousy which was a red flag. Also, the cool-decking is showing what looks like rust (brown) spots showing up.
I called the contractor and he said that sometimes this happens and he would check it out. I researched the internet and read that it could possibly be the rebar rusting out. On a three week old pool? I’ll try and post a couple pictures. Do you guys have any ideas?