08-31-2007, 03:17 PM
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Let me digress momentarily for your and hopefully other folks benefit.
A uniformly graded aggregate is one in which virtually all ot the stones are approximately the same size.
A well graded aggregate is one in which the stones vary in size and the stones "are graded" such that their sizes "mesh together" to form a semi-dense amalgamation.
Although I have never employed "the brightly colored stuff you get in most pet stores (green,grey and white)" I did "check it out" for my aquarium.
Most of the aggregates that I remember observing was uniformly graded and sub-rounded (ie. did not have sharp edges).
You can determine this from feeling of the material.
If it has sharp edges and corners then it is an angular material which Lupin was referencing as not being desirable.