I would much, much prefer to do this in batches.
I personally would not make a constant flowing system. I've lived right on the coast for years (Charleston SC) and the water conditions fluctuate quite a bit.
If you get a heavy rain, even the water right there in the surf, on the beach, can drop salinity at alarming levels. Native life isn't concerned, they're used to it.
Personally if I had the cash to plumb something like this, I'd pass it all through a micron filter, a big UV, and maybe a carbon filter..... into a container that held 1-2X my total system volume.
Once it's checked for salinity and proper levels of other critical issues (eps. phosphates, nitrates, and alkalinity) then I'd use it for larger water changes, maybe 10% a day.
I know on the Carolina coast, we have a HUGE amount of phosphorus. This would prevent me from using local sea water. Just too expensive to clean it up.
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