- Thu Mar 11, 2021 6:41 am
A good test to see if the sand is actually silica, is putting it in a bunch in vinegar. If the sand is made from calcium carbonate (alkaline and detrimental to most carnivorous plants), it'll start to bubble. You do want coarser-grained sand as well because if you use something like playsand, it forms into an almost clay-like substance when mixed with peat, and is impossible to re-wet after it gets dry. I've had good luck with Ace Hardware's pool filter sand. A benefit of pool filter sand is that it is pre-washed, so you don't have to worry about it souring your planting medium.