Quick answer: Compare the water loss with evaporation using a bucket test. Watch the weather, the surface covering, filtration operation and the point where the level stops dropping.
A drop in the water level can be normal evaporation, water carried out by swimmers, a leaking pipe, or a problem in the technology. It’s important to measure, not guess.
How to recognize the problem
- The level drops even without swimming.
- The area around the technology is damp.
- The loss is greater while filtration is running.
- The level stops dropping at a certain height.
What to safely check first
- Mark the water level and measure the drop over 24 hours.
- Do a bucket test next to the pool.
- Check the technology, connections and drain after backwashing.
- Compare the loss with filtration off and running.
- Write down the results for the service.
What not to do
- Do not backfill a suspicious spot without diagnosis.
- Do not ignore a leak near the technology.
- Do not keep topping up water without checking chemistry and salinity.
Prevention
- Use a surface cover.
- Check connections after winter.
- Track water consumption and changes after a service intervention.
When to call a service
Call a service if you suspect the piping, the liner, the skimmer, the jets, or a leak that changes significantly while filtration is running.
FAQ
How much evaporation is normal?
It depends on weather, wind, water temperature, covering and use. That’s why a bucket test comparison is more reliable.
Why does the water go bad after topping up?
Topping up changes the chemistry, temperature, hardness, salinity or stabilizer. After topping up, you need to test the water again.
Useful links
Sources
- Trouble Free Pool – technical community advice
- Pool & Hot Tub Alliance – resources for pools and hot tubs
- CDC – home pools and hot tubs, water testing
Next step
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