Possible fill-valve problem
The valve runs when the water is already at or above its intended level, water enters continuously, or the float is stuck, damaged, obstructed, or misadjusted.
This needs autofill or pool-equipment service.Hidden water replacement
The waterline looks perfect. Why does the autofill keep running?
An autofill can conceal a pool leak by replacing water before you ever see the level drop. It can also run because the fill valve has a problem or the pool is experiencing legitimate water loss. Separate those possibilities before paying to treat the wrong one.
Start with the equipment
Make sure the autofill is responding to the pool—not creating the problem.
Possible pool water loss
The valve stops after reaching the correct level but starts again frequently because the pool keeps demanding replacement water.
This needs a controlled water-loss test.Three-outcome test
Pause the refill safely. Let the pool reveal what is happening.
If you can identify the autofill supply and safely maintain enough water for the equipment, pause it during a controlled bucket test. Keep the pool on its normal operating schedule.
Evaporation is more likely
Weather explains most of the loss during that test period. Continue watching if the autofill still seems unusually active.
Review evaporation rangesLeak behavior is likely
The autofill was probably hiding water loss beyond evaporation. Photograph the marks and request professional detection.
Send the test resultRepair the fill control
If water continues entering when the pool is already at its intended level, the autofill itself may need adjustment or repair.
Protect the pump. End the test and restore safe water supply before the level can fall below normal skimmer operation. Do not manipulate an unidentified valve.
Bring useful evidence
Four details make the detection request stronger
How often it runs
Note whether you hear short cycles, long cycles, or nearly continuous flow.
What happens with it off
Mark the pool level and record the measured drop over the same period.
What the bucket did
Compare the pool’s drop with evaporation during the controlled test.
What else changed
Include the water bill, salt or stabilizer trend, wet areas, and pump-dependent behavior.
Know who to call
Fix the valve when the valve misbehaves. Locate a leak when the pool keeps losing water.
PoolLeakFix is focused on the second problem. If the autofill operates correctly but must repeatedly replace water, professional detection can determine whether the source is the pool shell, skimmer, fitting, light, equipment, or underground plumbing.
You do not need to identify the source yourself. The bucket result and refill pattern are enough to start the conversation.
Request professional detectionTechnical context: an automatic water filler maintains a preset pool water level. Frequent cycling can mask water loss, while maintaining the proper level helps protect normal pool operation. Sources: Pentair and American Leak Detection.
Autofill questions
Separate refill equipment from pool water loss
Does a constantly running pool autofill always mean there is a leak?
No. The fill valve may be stuck, dirty, damaged, or adjusted incorrectly. Weather, splash-out, backwashing, draining, and a pool leak can also increase water demand. The useful question is whether the pool loses more than normal evaporation when refill water is paused safely.
Can an autofill hide a pool leak?
Yes. It can keep the waterline looking normal by replacing water as it escapes. Frequent fill cycles, an unexplained water-bill increase, or steadily diluted salt and stabilizer can reveal the hidden replacement water.
Can I turn off the autofill to test the pool?
Only if you can identify the autofill supply safely and continue protecting the pool’s operating water level. Do not let the water fall low enough for the skimmer or pump to draw air. If you are unsure which valve controls it, ask a pool professional.
What test should I run with the autofill off?
Run a controlled 24-hour bucket test. Mark the pool and bucket levels, keep the pool on its normal schedule, avoid rain and heavy use, and compare both drops. If the pool loses noticeably more than the bucket, request professional leak detection.
Pool outdropped the bucket?
The autofill was hiding the evidence—not solving the problem.
Call 772-634-3037 or send the pool location, refill pattern, and test result.