I mean Im sure it’s fine to use, looks great. If you want to be extra safe just run some gfo and carbon with it for a couple days to asorb whatever leaches out.
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I took your advice and soaked them in rodi water, its been 24 hrs and i tested them for p04 and the reading came up as 0.5If you are concerned about anything leeching from the rock, you could soak them in rodi for a few days and then test - especially for PO4. Otherwise, rinse it and use it!