CH = 400 too high for a new gunite/pebble pool?

[KurtV]

It's the plaster dust coming off the new plaster that's making your CH rise. It's probably not a problem at it's current level but may become one (can cause scaling) if it goes much higher (especially at higher pHs like you're seeing). It sounds like your fill water is relatively soft though, so if need be, you'll be able to do a partial drain and refill to lower CH once your plaster stabilises.

Edit: Joel, I just re-read the title of your thread. Do you have actual pebble-tec or one of the knock-offs? It was my understanding that pebble-tec does not leach calcium.