E2 pH, 1970 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Surface 8.5 8.2 8.5 8.6 8.7 8.6 8.6 8.7 8.7 8.8 8.8 8.8 Source:McLachlan, A. J. (1979) The aquatic environment, chemical and physical characteristics of Lake Chilwa. "Lake Chilwa" (ed. Kalk, M., McLachlan, A. J. & Howard-Williams, C.), pp. 59-78.