) correcting infant mortality counts reduces the estimated effect of filtration on infant mortality by two-thirds, from -43 log … effect of filtration on total mortality by half, from -16 log points to -8 log points. In this rejoinder, we argue that the … much-reduced estimate of the effect of water filtration on infant mortality is a dramatic and surprising departure from the …

the literature, we provide new evidence on the effects of water filtration and chlorination, extending the work of …