We resurfaced our pool in Tropics Blue Stonescapes. The process seemed to go very well. I was here the entire time. Towards the end of the process I noticed one of the bottom returns leaking some water from the shallow to the deep end. There was obviously a darker streak, given it was wet before the pool filled completely. I've not done this before and these guys are "experts" so I said nothing. It's been 4 days and they are coming today for the second water treatment. Ph has been around 6 and have brushed daily and run pump steadily. The streak is still there. My contractor tried to explain why this happened. Frankly I don't care why. But I just want to know if he can get rid of it. He suggested taking Ph way down to get the surface more uniform overall, in addition to helping with this streak. Other than this spot, there is one other that is much darker and larger, but I can live with it. This one I can't live with and don't find acceptable. The picture is enhanced, and in reality is not this stark. Any advice as to whether this can be remedied? How to proceed with my contractor? Thanks, Jeff