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.

[joelq]

Hi Kurt - thanks for your reply. We have Stonescapes (and not PebbleTec).

[KurtV]

Joel,
I'm not familiar with that particular product but I'm guessing that it is plaster based and is the cause of your rising calcium hardness. Have you asked the builder or plasterer about it?

[dawndenise]

Any chance you were using calcium hypochlorite as your chlorination source prior to your SWG going online?

[joelq]

Kurt - I haven't asked the builder yet, but I guess that's the next logical step. I'm guessing though that Stonescapes isn't plaster-based as they have taken the pebble all the way out of the water for our beach entry. They also gave us an option not to do waterline tile specifically because of this reason (although we went with water line tile to have that "finished" look). Wouldn't plaster have to remain underwater?

DawnDenise - I was using bleach exclusively prior to firing up the SWG, so no calcium hypo.

Thanks!

[KurtV]

Joel, According to NPT's website, StoneScapes is plaster based.