Oftentimes, for a slow refill toilet tank after a flush, the issue is caused by a clog or low water pressure. In general, a single flush 1.6 gpf or 1.28 gpf toilet tank will take around half a minute (30 seconds) to one minute (60 seconds) to fill.
Here are a few steps to verify if your toilet tank takes longer than one minute to fill:
- Verify if the water supply valve is fully open. During the cleaning of the floor or after plumbing work is done, the water supply valve may be unintentionally closed down. Reopen the water supply valve fully and verify again if the tank's slow-filling issue has been resolved.
- Verify if the water in the tank at rest is filled to the water line or above the water line level. If water in the tank is filled above the water line, adjust the fill valve so water in the tank at rest will remain at the water line level. After the adjustment is completed, verify again by timing how long it takes to fill the tank.
- Verify if the flapper seals well after flushing. A defective flapper or a flapper that is not meant to go with your toilet tank may cause your toilet tank to take longer to fill.
- Verify if there is any debris clogging the fill valve. Rinse out any debris and re-test the tank filling time.
- If all the above steps do not resolve the issue of the tank taking longer than a minute to fill. Take a video of the toilet tank filling after flushing it. If you have more than one toilet that has experienced the same issue, make a video for each of these toilets
Click to download this Excel sheet and use this file to help you determine if your slow-filling toilet issue is caused by an insufficient water pressure in your bathroom.
Pressure Flow.xlsx
If the fill time for your toilet results in a slow filling, perform a flow check with your faucet tub to validate if the cause of your toilet's slow filling is caused by insufficient water pressure. Use an empty gallon milk bottle, and cut the opening bigger. Place it under your tub spout and time how long the tub spout need to takes to fill the gallon milk bottle. Use below reference chart below to determine the water pressure in your bathroom.
| Flowrate (GPM) |
Seconds
(fill 1 gallon container)
|
Seconds
(fill 1 quart container)
|
| 0.5 | 120 | 30 |
| 1 | 60 | 15 |
| 1.2 | 50 | 12.5 |
| 1.5 | 40 | 10 |
| 1.75 | 34.3 | 8.6 |
| 2 | 30 | 7.5 |
| 2.25 | 26.7 | 6.7 |
| 2.5 | 24 | 6 |
If both above tests show a low gpm in the result, your bathroom water system has low pressure. Contact a certified local plumber in your area to help you resolve the issue.
However, if only your toilet tank has a slow fill time but the tub spout test result with a fast water flow rate, most likely your toilet fill valve has a clog.
To obtain further assistance, please send the recorded toilet flushing videos along with your toilet model number to our customer care support center by email.
For more information, click to view the article on Defining a Good Flush.
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