ph varies a lot over a 24 hour period. You need to check the alkalinity. It would take some very acid water (in fish terms) to dissolve much concrete.

As ground- or rainwaters flow over and percolate through soil and underground rock formations containing calcitic limestone (CaCO3) or dolomitic limestone [CaMg(CO3)2], the acidity produced by CO2 will dissolve limestone and form calcium and magnesium bicarbonate salts:

http://srac.tamu.edu/index.cfm?catid=25

http://srac.tamu.edu/getfile.cfm?pubid=112








Last edited by ewest; 03/30/09 08:55 AM.