I think I found the problem. After reading about other peoples problems with their filters I decided to take the top off of the filter and check the sand. First of all the entire plastic assembly came up out of the sand I don't think it was suppose to do that. But what I found was that it was half empty of sand. Am I going to have to take all the sand out to get the assembly back down in it? And how full is the filter suppose to be from the top?