well here is a nice thing to see, when I was in Afghanistan I saw this pukani  Rock and loved it and wanted to get some but at $10 lb pound it was wow.  now with the Eco Reefer in ONTARIO.  OMGGGGGGGGGGGGGGGGGGg
Love the rock . well here is some of the stuff I bought 50lbs for 165 everything and it was at my house in 3 days  thanks Eco Reefer.
Im buying another 50 lbs here   oh ya pillars and ledges here I come I may even sell my old stuff.
Tell me that this is not Porous 
