I am running into a dilemma these couple days with DE. Initially my pump ran at high pressures and I backwashed several times and added around 50-75% DE after backwash. After several times, I start to notice DE in the pool. Tried to use Polaris to stir the water and hand pump but it seemed not working very well. I fixed the multivalve leaking by replacing the gasket, and also purchased a new set of grids to replace old ones. I am not sure whether I should add more DE to the pool since the new grid seems to discharge DE into the pool as well or maybe I should let the new filter to pick up most of the DE in the pool before adding more DE to the skimmer? To make things worse, I shocked the pool earlier this week and now my algae is gone but the whitish remaining is still in the pool.