By far the easiest way to add is to mix in a slurry and slowly pour that in the skimmer. You will also get a more even layer. I've popped my valve off for other reasons and the DE layer looks pretty uniform. Why fuss with taking things apart when you don't have to? One thing to be careful of is breathing the dust. Not good. The water slurry minimizes the risk. The amount you ultimately put in should be more dependant on the surface area of the sand. You've got nothing to lose by using a greater shot...if you overshoot, just backwash and start over.
Al
Bookmarks