What differentiates the Indus Valley approach to sanitation from that of the Roman Empire?

Indus Valley focused on private domestic systems while Romans focused on public communal systems

The Indus Valley and the Roman Empire represent two distinct philosophies regarding sanitation infrastructure. The Indus Valley Civilization utilized an approach centered on the individual residence, integrating private toilets and bathing facilities directly into homes and connecting them to city-wide covered drains. In contrast, the Roman Empire prioritized large-scale, public infrastructure, developing massive networks of aqueducts and communal latrines where multiple people shared a single, water-powered waste channel. This distinction marks the difference between private, domestic sanitation and public, communal sanitation.