One year Pool Owner and enjoying every minute of it.

[Spaceman]

We have been putting tons of sodium bi-carb in the pool. We are constantly balancing total alkalinity against the pH. Thanks for the input. We have an excellent pool builder that has greatly helped out on the chemistry. He even supplied a 50 lb bag of the sodium bi-carb.

[BigDave]

Great! I want your PB.

[PoolDoc]

. . . membership updated.

I highly, highly recommend that you get a K2006 testkit: http://pool9.net/tk/

This page explains what's happening to your alkalinity, why it's happening, and why it won't stop, unless you can bypass the infinity edge: http://pool9.net/alk-step/ The focus on that page is lowering alkalinity on purpose; you are doing the same, but accidentally.

There is a way to reduce -- not stop -- the loss, but it will require careful attention to your pH, TA & CH with ACCURATE (not pool store!) testing. Damage to your plaster is almost inevitable, if you don't learn this.