On Sat, 09 May 2009 12:37:10 -0500, Jules wrote:

Never seen one or heard of one with a granule filter in it. I wonder
how often the granules have to be changed :-((

Second chamber, probably not all that often provided the sludge in the
first is not allowed to get into the second.

.... or what they did with them afterwards.

Hose 'em down and put 'em back I should imagine. Bit of water isn't going
to harm 20mm granite bits. I suspect it would be better (easier cleaner)
to just pump out the second chamber then back wash the chippings.

--
Cheers
Dave.