I thought this would be helpful to some of us.

Her's a chart for Alk. relation to calcium.


Alk meq/L Alk dKH Calcium ppm
0------------0-----------360
0.5----------1.4---------370
1------------2.8---------380
1.5----------4.2---------390
2------------5.6---------400
2.5----------7---------410
3------------8.4---------420
3.5----------9.8---------430
4------------11.2---------440
4.5----------12.6---------450
5------------14---------460
5.5----------15.4---------470
6------------16.8---------480
6.5----------18.2---------490
7------------19.6---------500