For those of you struggling to find a coarse sand (I am) I found something that looks as coarse as the sand in PR Giants pictures and may be better than sand for those of us outside the tropics. It is a baked clay product that looks like those standard red clay pots chopped in tiny uniform particles. It is sterile, very coarse, fairly cheap, has tiny pores in each grain, and may be widely available. It is heavy. It drains like water through a window screen. You can not get water to puddle in a pot. It runs straight through. Is it a good grow medium? I have used it this summer with good results. I do not know the qualities of it versus other mediums. I potted up an AeAe, a Florida, two NoNo, and several sensitive Alocasia's as well as some palm seedlings and all are doing well. It's called "Turface MVP". All are doing well in a mix with 3/4 MVP and 1/4 perlite, with just a handful of organic potting mix thrown in (I know that adds up to more than 4 quarters but you get it). I will post a link but if it does not help they use this stuff on athletic fields so many cities and athletic organizations may be able to tell you a local seller. My link shows a bag that weighs 50 pounds and is about as large or a little larger than the largest potting soil bags sold at say a Wal Mart.
https://www.ewingoutdoorsupply.com/5...ld-conditioner