Modeled solar disinfection of phages MS2 and ϕX174 in sunlit waters.
ϕX174 is mostly inactivated by endogenous, MS2 also by exogenous processes.
Major reactive species causing in exogenous inactivation depends on DOC.
ϕX174 inactivation is more strongly affected by season, latitude, and DOC.
Modeled inactivation rates corresponded well to field observations.