Considering the studies showing little or no improvements on health in WASH post-intervention trials (Luby et al. 2018), (Null et al. 2018), (Humphrey et al. 2019), (Clasen et al. 2015), what are your expectations for HWTS?  

Check out the history of HWTS interventions onto Gartner's Hype Cycle (graph: expectation vs time) published by Rosenthal et al. 2020  and please provide your comments.