PH buffer is a 5:1 baking soda:washing soda. C02 will actually lower PH. Washing soda will fire up your PH quite quickly, though(hence the mix... doesn't effect PH too badly... more for the Alk. Washing soda is baked baking soda. Angie, sounds like you may need to keep up a bit more on keeping your reactor charged(PH of 12-12.5)... with evap and auto kalk top-off, you should find that your Ca/Alk levels are more stable. BTW, test your mag levels, too(1300-1300). Ooops... sorry Whoyah... I see you got that covered.

Repto