Quick question. I have a Hayward DE4820 Pro-Grid and it was leaking out of the MAR assembly. I just got the two O rings I need and hopefully that will do the trick. My pool was up and running for a week until I needed this fix and another. I emptied the water out of the Pro-Grid through taking out the bottom screw cap to do these fixes. The filter grids still look to be coated with DE. The question is: do I need to wash out all of the DE and start over, or can I replace the O rings, put the filter back together and start up the pump as normal without adding any more DE? Thank you.