Hey Jhale,
I think it depends on how much flow(particulate sand size), and if its going to be all one sand type and size, or a mixture
I'd recommend BB

, sorry had to throw it in

But really Southdown (now named Caribbean Play Sand, blue bag )is aragonite based sand and you can't beat the prices w/ a stick. I know there is some local to me 07205 NJ
BTW
Ive seen it pop up in a few places;
from my experience after not following the advice of a friend w/ a 210 w. DSB you CANNOT re-use people sandbeds, at least not in the quantities you might think, couple cups is fine to repopulate, but tearing up your sandbed and taking it all out and re-using it will mix the anaerobic w/ air. Instant death, and all your carrying home is hydrogen sulfide (stinky egg smell) back home, in other words someone elses garbage back to your tank. (Dicey humor alert). I even washed mine out, (more green buckets than you can shake a fist at), to no avail, my system crashed.
I can't really recommend DSB as I dont agree w/ it, especially long term, but those are some of my own sandy experiences before i went BB.
My Girl friends tank has a SSB FWIW and shes voluntarily following my advice(after noticing all the fish poop settles on the sand), and siphoning that top layer of sand w/ all the poop and adding sand back whenever necessary.