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Is the skimmer plastic? Does it have a black bottom? If so, there is a kit for this. Check out black bottom skimmer repair - search.
Dig it up and replace the leaking section.
It would be easier to replace with a floating skimmer Check poolrite dragonfly
First you have to identify the fluid that is leaking then locate the source of the leak before we can tell you how to repair it.
Average is $12,800 with the filing fee's testing , inspections and materials
Some typical radiator repair jobs are leaking hoses, leaking radiators or loose connections.
Replace the leaking part
You will be better off replacing it that trying to repair it.
In Australia there is a material Known as Selleys Aquaneedit this is a two purt putty that sticks under water and goes hard I have used it for plastic repairs in pools and it has worked well
stuff it with paper
Replace the part it is leaking from.
You could repair a leaking fuel tank by taking it off of the vehicle and welding it. Once the welding has dried you may put it back on the vehicle.