We just replaced a broken garbage disposal with a new one and it is not draining. Plus when turned on it has a very obnoxious grinding noise - even though the box says it\'s quiet. We\'ve checked the traps and the pipes - they are all clear. Connections are tight and there are no leaks. It\'s the same size as the one that we replaced. Any suggestions?The new disposal is a Criterion Stainless Steel Food Waste Disposer, Series 500,681-4012, 1/2 HPThe old disposal (has a crack that is why we are replacing) is a Badger Insinkerator, 1/2 HP, Model 5-84We don\'t know the age of the existing disposal - we just purchased the house and it started leaking 3 days after we moved in. We found a crack and that is why we are replacing.Thank you for your help!