Welcome and that will happen no matter who you are and what filter you have running ,it is just from the temps going up and down like crazy ,longer days ,more sunshine and rain .You just have to get you filter going and hope and pray to the pond gods that it gets clear again .I use quilt batting to pick up all the fine stuff coming out of the filter .Believe it or not that murky stuff is fine particles that the batting will pick up .Just takes a lot of rinsing of the quilt batting .I hose mine off and then soak it in peroxide and keep at least 2 pieces going when ones soaking the other goes in .Remember city water has to be treated .Get some solar salt also from a hardware store ,blue bag .If i remember there is a thing on here that tells you how much per gallon