Living near the beach, as I do, I have access to tonnes of seaweed, and
I remember hearing something about it being good for breaking up clay
and generally good for lawns etc.

The thing is though, what exactly do I do with it, before I use it?

Its too slimy to put through the shredder; does it compost?

How do you prepare this stuff for use as a soil improver, or do you just
dig it straight into the soil?

Also, is coastal sand any use for mixing my own compost, or is it too
alkaline? Is there any simple and cheap way to treat beach sand to make
it usable, or is it ok untreated?

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Thanks,
[H]omer