This project demonstrates how the potential and resilience of existing assets can be maximised through focused, collaborative engineering without the need for full replacement. The objective was to increase flow-to-full-treatment (FTFT) capacity at an operational site, working entirely within existing physical, hydraulic, and operational constraints. Significant challenges were present in both the inlet works and the storm overflow system. The existing detritor was often inoperable and, when functioning, allowed grit to pass into downstream processes—raising maintenance requirements, accelerating asset wear, and reducing operational resilience. The storm overflow system was also in poor condition, further restricting performance. As Project Lead, I guided a multidisciplinary team to develop a redesigned detritor solution that allowed for a second detritor unit while optimising both the inlet works and storm overflow, fully integrating with the existing infrastructure. Crucially, our approach kept the site operational throughout construction, as the existing assets were needed at all times. This avoided the need for costly overpumping arrangements, minimised risk, and reduced service disruption. The integrated design is projected to improve grit removal efficiency, increase FTFT capacity, enhance storm flow management, and reduce downstream maintenance. Reusing existing assets delivered a sustainable, resilient solution for long-term asset performance.