Hi Amanda, we are sorry to hear about that. Did you replace the gaskets for the skimmer when it was reinstalled? And let us know what the model of the filter is so we can help with that as well. Pictures of everything and images of labels with model numbers would be very helpful.
Note that there are a LOT of different skimmers out there, so any part numbers you can get off of any of the skimmer parts would be helpful if you need a gasket for it.