Yes, when I first read the response, I also misunderstood. But I'm late back to the thread, and Georg had also responded with more detail.
Yes, the reason I asked the question is because some folks who are attempting SH only flush water to top once in awhile. Growing well in SH does require frequent flushing, and it sounds like Georg is doing it.
__________________ Caveat: Everything suggested is based on my environment and culture. Please adjust accordingly.