Has anyone ever had a stamped concrete patio installed nearby an existing pool?

We had a little algae before the pour (they cut the power wire to the pump while excavating). Pump was down for a day during 90 degree heat. I got it up and running a week ago, but the pool still looks "sick" (water isnt clearing up as fast as it usually does, etc).

Tested it and noticed the pH is thru the roof....at least 8.2 (it was perfectly balance before the pour). Im sure some of it is algae but Ive shocked it long enough that everything should be dead. I did, however, find some of the coloring dust they used on the patio floating on the water. Im wondering if this threw off my perfect pH. I cant find any MSDS papers on the stuff, I was almost considering trying to get some off the patio and test it myself

Thanks in advance.

-Chris