Quick Answer:
If a toilet that worked before a remodel now refills slowly, start by checking anything the remodel disturbed: the shutoff valve, the supply line, and the fill valve screen. Often construction dust or small debris has entered the supply or the valve screen and reduces flow. Inspect supply line for debris after remodel, remove fill valve screen and clean if construction dust is present, then test the valve and replace parts if cleaning does not restore normal flow.
Why This Happens
- Remodeling creates dust, drywall mud, paint chips, and bits of pipe paste that can get into open plumbing or push through partially closed valves.
- Shutoff valves may have been bumped, partially closed, or replaced with a lower-flow model during work on the room.
- Fill valve screens and in-line aerators can trap fine particles and slowly clog, reducing the refill speed.
- If your situation resembles other after-work problems, see related notes like Tank refills slowly after filter install or Slow refill after turning water back on for similar troubleshooting approaches.
Step-by-Step What to Do
1. Confirm other fixtures and the shutoff
Turn on a nearby faucet to see if household water pressure seems normal. Locate the toilet shutoff (angle stop) and make sure it is fully open. If multiple fixtures are slow, the issue could be upstream.
2. Inspect the supply line for debris after remodel
Shut off the water to the toilet at the angle stop, disconnect the supply hose at the bottom of the tank, and look inside the hose and tank inlet. Use a flashlight. Small pieces of drywall, sanding dust, or plumber’s debris are common after work and can block flow.
- If debris is visible inside the hose, flush it into a bucket and rinse until clear.
- If the supply hose is braided or old, consider replacing it while you’re working—new hoses are inexpensive and quick to swap.
3. Remove fill valve screen and clean if construction dust is present
Many fill valves have a small plastic screen where the supply enters the valve. With water off and the tank drained, remove the top of the fill valve (follow the valve manufacturer’s instructions) and pull out the screen. Rinse the screen under running water or soak briefly to dislodge dust. Reinstall and test.
4. Test the shutoff and fill valve operation
With the screen cleaned and the supply reattached, open the shutoff fully and let the tank refill. Watch the flow into the tank. If flow is strong then weakens, the shutoff may be partially blocked or failing. Gently operate the shutoff fully closed and fully open a few times to clear minor deposits.
5. Replace parts if cleaning doesn’t help
If cleaning the screen and clearing the supply line doesn’t restore normal refill speed, replace the fill valve and consider replacing the supply hose. These parts are inexpensive and typically straightforward to install. After replacement, retest the refill speed.
What Not to Do
- Don’t ignore remodel debris inside valves—this often worsens the problem and can damage parts if left trapped.
- Don’t force a stuck shutoff hard; you can break the valve. If it won’t move, call a pro.
- Don’t pour harsh chemical drain cleaners into the tank or supply line; they won’t clear mechanical blockages and can damage rubber parts.
- Don’t assume the problem will fix itself—if cleaning fails, a plumber is appropriate.
When to Call a Professional
- If multiple fixtures are slow after the remodel, suggesting a main line or pressure issue.
- If the shutoff valve is seized, leaking, or you cannot confidently remove and reinstall the fill valve.
- If flow remains poor after cleaning screens and replacing hoses and you want a pressure/line inspection.
Safety Notes
- Always shut off the toilet’s water supply and flush to empty the tank before disconnecting hoses or opening the fill valve.
- Use a bucket and towels to catch water when disconnecting the supply line.
- Wear gloves and eye protection when working around construction dust and dirty plumbing.
- If you smell gas, see electrical damage, or encounter corroded fittings, stop and call a professional immediately.
Common Homeowner Questions
- Why did this start right after remodeling? Construction dust and small debris often enter plumbing during work and can lodge in supply lines or valve screens.
- Can I clean the fill valve myself? Yes—turn off water, drain the tank, remove and rinse the screen; replace the valve if cleaning does not help.
- How long should this troubleshooting take? Basic inspection and cleaning usually take 20–45 minutes; replacing parts may take longer.
For more related articles, see the nan hub.