HELP - leak maybe? advice

[xoroniox]

Ok i have a 28x14 inground diamondbrite pool from my calculations 13,000gallons, the problem i have recently noticed is the water level dropping about 2-3 inches per 24hours while the filter is on, when it is off maybe 1inch of drop in water level in 24hours, i cannot see any leaking plumbing around the filter or any exposed pvc plumbing, nor can i see any water or wet spots around the pool. i need any help or advice, how to go about finding the leak? is it something a do-it-yourself home owner can repair and anything else which can help me in this situation. Thanks in advance


one other thing i have noticed while the water level is below the skimmer and the barracuda is off, the water level is good which leads me to believe the leak is somewhere between the skimmer pvc to the filter, but how do i confirm this? and does this make sense to people with experiance in this type of situation. Thanks