At one of the facilities I oversaw in the past we used to give free passes upon fecal closures. Then we started experiencing multiple incidents 30 minutes or so before closing (intentional?!), so we began issuing passes with time markings for admittance on another day after the hour of incident occurence. The number of incidents reduced significantly. (correlation?!)
The facility I oversee now has multiple pools, so we simply consolidate people into the other pools until fecal comntamination procedure has been observed. Regardless of complaints regarding specific features unavailalbe for that short time, we do not issue passes or refunds.