Hi folks, today was plaster day and everything looked great. We have a raised spa along with the pool so we started filling both simultaneously using the bicarbonate method. Shortly after, we had to switch out the hose that was in the spa as it wasn’t working correctly. After doing so, we noticed a stain on the seat of the spa. I attached a picture. It definitely wasn’t there before filling and our PB doesn’t know what it is. Any thoughts? We are continuing to fill and hoping we can fix it after the fact because we obviously can’t stop mid fill. The only thing that changed was the hose briefly being switched out. It was a yellow hose, but the stain looks like an orange splash so I don’t think it’s color leeching off of it. Could moving it and water splashing onto the seat have caused it? We are adding Startup-Tech to the water barrel and it’s orange, but it wasn’t poured directly into the spa. Any help or feedback is greatly appreciated.