Just cleaned out my filter and was surprised to see that the DE was a blue color . I have used some algae treatment this year that was a dark blue in color but would be surprised it would turn the DE this color . This is the first time in about 8 weeks I have changed the earth . Anything to be concerned about or anything to look for ? I had this once befoe but then was also getting some staining on the steps etc. Did a metal clean up and have been good since .