25lbs for $4.68....100% diatamatious clay. (or pool filter clay is cheap
also, in the pool chem aisle)

Not meaning to be persnickety, but diatomaceous earth is not clay. It's
actually little sea creatures, diatoms to be more exact. Not stuff to be
mixing with water and planting plants in, since breathing in the powdered
form can be harzardous to one's lung/health. ~ jan