Just put garden hose into sand filter to flush out. Wasn't a whole lot of stuff, it was hazy for probably a minute or so, then I was able to see the sand more clearly. Used a thin piece of pvc pipe to crunch around in the sand, being careful to watch for the "whatever those things are called" ☺. Once everything was back connected I turned filter back on. Water shot out really strong for about 10 seconds, looked bubbly at first but wasn't cloudy like before. Guess all I can do is wait and maintain slam.