Yeah, thanks again man. I have no problems sorting through all the sticks, leaves and random bits, I got a lot more out of it than I expected
I usually just use plain sand, sometimes with commercial clay balls. I've been trying out some DIY clay balls and got good results with them. I figured garden soil is bound to have more nutrients that just sand alone, hoping to get some fine results here 8) If I could do it again, I'd only make the sand 40mm deep, 50mm might be a bit deep for the hairgrass to send roots right down.