Can someone give input on a pool build in process? We are in the final stages and just got our pool plaster pebble sheen installed on Thursday . The pool co. sent out an employee to acid wash the shell . He started in the spa and we noticed as we are filling it with water the glass tile looks dulled and grout color seems to have changed from gray to white on the spillover . Any input on what might have happened ? It also seems to be discolored on front of spa tile where flows from spa. Thank you .