I turn on a pump to empty water from the sump directly to a drain, then another pump fills again from my fresh mixed SW reservoir. I could automate this with my Profilux controller, but I 'm standing there anyway so I don't see the point.
Once in a blue moon I attach a hose to the pump and suck out my sump, bigger chunks I get with a baster. I pretty much leave the little bit of sand I have alone. With the flow in my system, and running filter socks I don't get much buildup anywhere.
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