Why Is My Toilet Slow to Fill?

Is your toilet tank filling more slowly than usual? This is a frequent toilet issue with several possible causes. Thankfully, none of them are serious concerns or expensive to fix. Follow this guide to get your slow toilet flowing properly again. 

How to Repair a Slow-Filling Toilet 

Learning why your toilet is slow to refill is the first step toward fixing it. Keep in mind these potential reasons and how to handle each one. 

Partially Closed Water Supply Valve 

Take a peek behind the toilet for the water supply hose attached to the wall. You’ll find a valve connected to it, which helps you to shut off the water during toilet repairs and replacements. Check this valve to make sure it’s completely open. 

Problems with the Fill Valve or Tube 

The fill valve, which you’ll find connected to the top of a vertical tube-shaped part in the toilet tank, regulates the flow of water into the tank. A toilet fill valve could wear out, clog or reposition out of alignment after years of use, stopping the tank from filling appropriately. Follow these tips to adjust, unclog or fix the fill valve: 

• Locate the fill valve: Open the toilet tank lid and find the fill valve inside. It’s commonly mounted on the left side with a tailpiece extending through the bottom of the tank and linking to the supply tube and shut-off valve. 
• Adjust the fill valve: Make sure the fill valve is secure and evenly fastened to the tube. Change the fill valve height if required by turning the adjustment knob (typical to newer toilets) or use a flathead screwdriver to loosen and adjust (required for older toilets). After that, make sure the water level is about one inch below the top of the overflow tube. 
• Clean the fill valve: To eliminate mineral buildup and other debris from the valve, first shut off the water in the rear of the toilet and take off the fill cap. Right after that, slowly turn the water back on, cupping your hand over the valve to prevent from being sprayed by the water. Let some water flow for several seconds to flush out dirt. Next, scrub away mineral buildup on the fill cap. If you notice cracks or excessive wear and tear, replace the valve. 
• Clean the valve tube: Dirt inside the valve tube could also be the culprit. Shut off the water supply and take off the valve hardware. Afterward, run a slim wire or bottle brush into the tube. Start the water supply slightly to flush away the remaining residue. Replace the valve hardware and check if the toilet fills quicker. 

Waterlogged Float Ball 

The float ball in older toilet models rises with the water level, sealing the fill valve whenever the tank has filled. If the float ball is damaged or punctured and fills with water, it prevents the tank from filling properly. 

Pull up the tank lid and view inside. A partially sunken float ball could be waterlogged. Before running out to buy a new ball, examine the float arm it’s connected to. If the arm is directed too low in the tank, bend it up somewhat to lift the ball’s height. 

If that does not do the trick, then it might be time to just replace the component entirely. Just remember that this is old toilet technology, so it may well be better to modernize the existing tank hardware or change out the toilet completely. 

Blocked Plumbing Vent 

Your home plumbing system uses vents that allow air to enter the pipes. If they are clogged, pressure may build inside of the pipes, blocking the water from flowing. This can, in turn, make your toilet slow to fill or even cause the bowl to flood. 

You need to get on the roof to check for clogged plumbing vents. Look for long, vertical PVC pipes poking up from the shingles. Clear away any animal nests, deep snow or other obstructions you find to ensure your plumbing works properly. 

Leaky or Blocked Pipe 

If you can’t find anything wrong with the water supply valve, fill valve and tube, float ball or plumbing vents, the slow toilet dilemma could stem from your supply pipes. A problem with the water line itself could stop your toilet tank from filling appropriately. It’s best to hire a licensed plumber to tackle these issues. 

Schedule Toilet Repair with Service Experts Heating, Air Conditioning & Plumbing 

Is your toilet still not working right? Turn to Service Experts Heating, Air Conditioning & Plumbing for reliable toilet repair in the U.S.. We can pinpoint the reason why your toilet is slow to fill and perform a budget-friendly repair. If the fixture has hit the end of its average life span, our company can suggest high-efficiency toilet replacement in the U.S.. We’ll help you decide on the replacement model and install it for you. Rest assured that every job we execute is protected by a 100% satisfaction guarantee! To schedule a visit from us, please contact Service Experts Heating, Air Conditioning & Plumbing today.