Are people able to sprout in rock wool plugs, and then add these sprouts in plugs to one basket full of this ball media?

Yes they are compatible, flush the hydroton clay media atleast 3 times with plain water before using in cultivation, or else your water is going to be disgusting from clay residue/dust

can this be used as a base in a saucer to sit a pot on in order to keep from sitting in water?

You probably could do this in a hydroponic setup, but it probably wouldn't be the most effective use of the clay. Each clay ball in the hydroton is a slightly different size, so it wouldn't make a very good base. It's also fairly expensive just to be used as a support.This stuff seems to work best as a grow medium; you could fill a flower pot with it, and it would probably wick water all the way up to the top. It absorbs moisture really well.

These are made of clay that is expanded in a special kiln making the pebbles more porous (and more capable of retaining moisture) than they would be if just fired at a low temp and a standard look like a terracotta pot.

Product Dimensions	30.48 x 24.13 x 3.81 cm; 907.18 g
Part number	CzLECA2lb
Material type	clay
Moisture needs	Moderate Watering
Sunlight exposure	Full Sun, Partial Shade
Soil type	Clay Soil
Item volume	1.85 Litres
Manufacturer	Cz Garden Supply
Item model number	CzLECA2lb
ASIN	B00GN9A6LK

Expanded Clay Pebbles

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