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Try the bucket test to determine if water loss is due to evaporation or a leak.

The Bucket Test

The "Bucket Test" will determine if water loss in a pool is due to evaporation or a leak:

1. Bring pool water to normal level.
2. Fill 5 gallon bucket with pool water about 3-4 inches from top.
3. Place bucket on first or second step of pool.
4. Mark water level on inside of bucket.
5. Shut off pump and mark pool level on outside of bucket.
6. Resume normal pump operation. Make sure auto/manual fill valve is off during test.
7. After 24 hours, compare the two levels. If the pool water (outside mark) goes down more than the inside water level, there is probably a leak.

In case of rain, repeat the test.

Test is not valid after 24 hours.