Buffer is a solution's resistance to change in
pH, not a specific
pH.
pH,
Ca and
alk are all tied together. Have you tested them? Have you tried aerating a cup of water with outside air for an hour and retesting? It may be that there is too much CO2 in the indoor air and that is lowering
pH.
Sodium bicarbonate has a
pH of a little over 8, sodium carbonate's is higher about 11.
Calcium reactors LOWER the
ph.
