All dry rock never used onceCuring the rock, or the tank cycle more or less. Some do it out side the tank in brute or other containers. I'm assuming (maybe incorrectly) that the rock is dry rock and never been through cycle.
They are stainless steelNice build!
I would replace the metal hose clamps on your return with some Nylon ones.
ThanksStainless will rust. I ended up buying titanium ones for on the Abyzz pumps. they were hard to find, ended up ordering them from Italy I think.
I'll hunt living in Canada it's hard to find the stuff like The usYou could also use nylon hose clamps. They are pretty snug, especially if you put them on when the hose is warm. Also easier to remove these.
I'll hunt living in Canada it's hard to find the stuff like The us
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Something you wish you can go by locally and if it doesn't work return
But company sold from is USA so not sure how that works..Those are at least Amazon.ca.