When the pool company closed the pool for winter, they left the plug out of the deep end skimmer. Now when I turn that skimmer on, it creates a problem with the filter (whirling water, loss of prime). I think something critter-wise may have gotten in there. I've called the company repeatedly but only one call back with an "I'll call you back later" response. Is there something I can use to try to unclog the line without causing further damage? I've searched the forums here but can't seem to find this exact problem. Thanks for any help you can provide.