I got acquainted with a maddox when I had to dig clay. The wider
blade worked better for me than a pick.
Hal

I must have missed that, so Robin is digging in clay? That would be a good
reason to nix vortex, as one has to go deep.

Robin, you mentioned the black foam. All the rocks around my pond and in
the waterfall, etc. are dry stacked. No foam or mortar. This has given me
the freedom of changing things easily. So before you do anything permanent,
dry stack and run first, imo. ~ jan

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~Power to the Porg, Flow On!~