I have a relatively new pool with a pebble tec type finish - its plaster with the 3M chips. Anyway, after they apply the plaster, they acid washed the pool to bring out the blue chips. There are three areas where there is too much plaster left and it looks like white sploches. One area was on the seat in the spa so I drained it down, poured acid, brushed and it now looks perfect. The problem is, the other two areas are on the bottom of the pool. I've heard of the trick people use to remove algae stains by pouring acid down a pvc pipe onto the spot and was wondering if this would work.
Alternatively, I was thinking of going under and using a suction cup sort of like the end of a plunger over the spot, squeezing out the water, and then injecting acid into it using a syringe. Then brushing the area under water. That would provide a higher concentration of acid on the spot.
Or should I just leave the splotches. The PB said he would fix them, but frankly I don't want him touching the pool finish since it would be him and not the guys that do it all the time.