Despite all the benefits of prefabricated swimming pools, there are some downsides as well. The most dreadful problem with them are leaks. If the pool is not fixed on a proper foundation with even bottom support, leaks can happen. However, one leak does not render the entire pool useless. It is possible to fix the leaks. In the case of vinyl pools, sharp objects are their worst enemy. Things like needles and knives can tear through material and cause the water to come out. Sometimes you will find spider cracks on the pool lining. This can happen either due to a manufacturing defect or any major mishandling.