I'm surely not the expert on DE filters, but I do know DE should NOT be blowing through your filter. Too much DE would clog a properly operating filter, not blow through it. If it's turning green, that probably means you have an algae problem that is not directly related to the filter issue. To get good answers, tell us the brand and model of the filter, how you are testing your water chemistry, chlorine, ph, cya, etc. levels. I'm pretty certain the experts here will advise against flocculants.