Why Is My Toilet Slow to Fill?

Is your toilet tank filling more slowly than usual? This is a known toilet predicament with several possible culprits. Fortunately, none of them are serious concerns or costly to deal with. Follow this guide to get your slow toilet functioning efficiently again.

How to Repair a Slow-Filling Toilet

Finding out why your toilet is slow to refill is your first step toward fixing it. Consider these possible reasons and how to deal with each one.

Partially Closed Water Supply Valve

Check behind the toilet for the water supply hose attached to the wall. You’ll see a valve connecting to it, which helps you to close off the water during toilet repairs and replacements. Make sure this value is open by turning it to the left.

Problems with the Fill Valve or Tube

The fill valve, which is connected to the top of a vertical tube device in the toilet tank, regulates the flow of water into the tank. A toilet fill valve might wear out, clog or slip out of alignment after years of use, hindering the tank from filling right. Follow these instructions to adjust, unclog or fix the fill valve:

  • Search for the fill valve: Lift the toilet tank lid and find the fill valve inside. It’s usually installed on the left side with a tailpiece extending through the bottom of the tank and attaching to the supply tube and shut-off valve.
  • Adjust the fill valve: Make sure the fill valve is secure and evenly attached to the tube. Change the fill valve height if needed by twisting the adjustment knob (found in newer toilets) or use a flathead screwdriver to loosen and adjust (required for older toilets). Then, make sure the water level is roughly one inch below the top of the overflow tube.
  • Clean the fill valve: To remove mineral buildup and other dirt from the valve, first shut off the water behind the toilet and take off the fill cap. Then, slowly turn the water back on, cupping your hand over the valve to prevent from being sprayed by the water. Let the water flow for a few seconds to flush out the buildup. Next, scrub away mineral buildup from the fill cap. If you observe cracks or significant wear and tear, replace the valve.
  • Clean the valve tube: Dirt inside the valve tube could also be to blame. Turn off the water supply and remove the valve hardware. Then, run a slim wire or bottle brush down the tube. Start the water supply slightly to clean away the remaining residue. Re-install the valve hardware and verify if the toilet fills properly.

Waterlogged Float Ball

The float ball in older toilet models rises with the water level, shutting the fill valve once the tank has filled. If the float ball is filled with water, it prevents the tank from filling correctly.

Pull up the tank lid and look inside. A partially submerged float ball may be waterlogged. Before you replace the ball, look at the float arm it’s secured to. If the arm is fixed too low in the tank, bend it up somewhat to lift the ball’s height.

If that fails to solve the issue, you might want to simply buy a new float ball; the average cost of this product ranges between $7-$20 in most hardware or home improvement stores. But it's worth remembering that this is an older toilet design, so it may well be better to modernize the existing tank components or switch out the toilet altogether.

Blocked Plumbing Vent

Your home plumbing system features vents that enable air to enter the pipes. If they end up being clogged, tension may build inside of the pipes, blocking the water from flowing. This can, in turn, make your toilet fill slowly or even cause the bowl to overflow.

You need to get on the roof to look for clogged plumbing vents. Start looking for long, vertical PVC pipes poking up from the roof tiles. Get rid of any animal nests, deep snow or other obstructions you notice to ensure your plumbing works properly.

Leaky or Blocked Pipe

If nothing is wrong with the water supply valve, fill valve and tube, float ball or plumbing vents, the slow toilet issue could stem from your supply pipes. A water line leak could restrict your toilet tank from filling properly. It’s safest to hire a licensed plumber to tackle these issues.

Schedule Toilet Repair with Service Experts Heating & Air Conditioning

If these tips did not handle your issue, look to Service Experts Heating & Air Conditioning for dependable toilet repair in Shreveport. We can identify the reason why this is happening and perform a budget-friendly repair. If the fixture has hit the end of its useful life span, our team can suggest high-efficiency toilet replacement in Shreveport. We’ll help you decide on the replacement model and install it for you. Relax knowing that every job we perform is supported by a 100% satisfaction guarantee! To schedule a visit from us, please call Service Experts Heating & Air Conditioning today.

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