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Toilet · Repair Copilot

Toilet fills slowly

A toilet that fills slowly is almost always the fill valve — debris or mineral buildup restricting the water flow, or an old valve past its five-year life. Sometimes it's just the shutoff valve not fully open. Take the tank lid off, point your camera inside, and a 30-year plumber persona walks you through clearing the valve and getting the refill back up to speed.

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Steps to fix toilet fills slowly

  1. Check the shutoff valve on the wall behind the toilet is turned fully counterclockwise (open) — a half-closed valve slows the fill.
  2. Take off the tank lid, set it somewhere safe, and watch a fill cycle to confirm the water trickles in slowly.
  3. Shut the water off, flush to empty the tank, and remove the fill-valve cap on top of the valve.
  4. Cup your hand over the open valve, turn the water back on for 10-15 seconds, and let the pressure blow out any debris caught in the inlet, then reseat the cap.
  5. Confirm the float is set so water stops about an inch below the top of the overflow tube.
  6. If it still crawls after cleaning, the fill valve is worn out — a new one is a cheap, tool-light swap with the water shut off.

Safety first: if a step calls for gas, a main water or sewer line, a service panel or main breaker, or a sealed refrigerant system, stop and call a licensed pro — Repair Copilot will tell you when you're there.