Losing all water pressure in your home when you flush the toilet points to a shared plumbing supply issue, a failing pressure-reducing valve (PRV), or heavily corroded galvanized supply pipes. When an old toilet fill valve opens to refill the tank, it demands a high volume of water; if your home's main water supply lines are restricted by mineral buildup or a failing PRV, water pressure throughout the entire house drops sharply until the tank fills. Verification: Check if water pressure drops at nearby sinks when the toilet fills, and consult a licensed plumber.
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