Suppose chemicals could be added to treat the high iron levels in either sample. The chemical additive would be safe to use in Sample 2 and not safe to use in Sample 1 if:

F. The chemical additive caused a drastic increase in pH levels in unbuffered solutions.
G. The chemical additive caused an increase in water hardness levels.
H. The chemical additive caused a decrease in total dissolved solids.
J. The chemical additive increased the amount of dissolved solids by at least 200 mg/L.