Wealth on Instagram: "This repair is done with the cistern still full and under pressure, leaving no room for mistakes. 🤯⚙️ In many off-grid and rural water systems, draining a cistern just to replace a valve isn’t practical. Emptying the tank can disrupt pressure balance, introduce contamination risk, and leave a property without water for extended periods. Instead, experienced plumbers perform the swap while the cistern remains full, working against gravity head pressure rather than a continu