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For years I have been using "fine red flint filter gravel"  that  I purchased
from pool supply stores that is normally used as a filtering agent in swimming
pools.  I have always had great success with this stuff.

Today I visited 3 different pool supply shops and none of them had this red
flint any more.  Instead they all were selling silica sand for swimming pool
filters.  From my understanding this is the same consistancy.but is silica
not red flint.

Has anyone used this stuff?  Is it as good as the stuff I used in the past?
Is it safe?  And what possible adjustments will I have to make if I switch to
the silica?