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The bucket test is used to take evaporation out of the picture (mark the pools water level, fill a bucket with water and mark the bucket level and set it on a step - check the next day and see if the pool level has gone down more than the bucket level) - if the bucket looses less water than the pool, you've got a leak.
The next step is to do a 'static test'. Plug all the lines going into and out of the pool while doing the bucket test. If the pool looses more water than the bucket - the pool vessel is leaking, if they loose the same amount, you've got a leak in the plumbing.
If you have a leak in the plumbing, pressure test the lines to figure out which line is leaking. (there are ways to isolate which line is leaking but, I'll stop here for now - and be ready to answer any questions you have, when they arise)
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