ok substrate test inprogress.
Colour, Cost and... thats probably it. well if you look at the perfect composition for a dsb by Dr Ron the dolomite is probably a little better as it has more fine stuff in it (according to his chart even sugar sand is overall to coarse) but that is just one brand of dolomite I don't know the sizes or compositions of other brands.
for me thought.. it is cost and colour.
Steve
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