Ok, then just for kicks, how many years WOULD it take? I've had
flourite in a 30g for 3 years, and it's breaking up into smaller
particles and smaller... Every year, I kinda break it down a bit and
suck the compacted 'dust' off the bottom, and I've always added a
couple handfulls of flourite back into it, just in case... but I'd like
to know how long it's effective, myself... Should one totally(more or
less) break a tank down and replenish it?? ( why not? other than simple
cost and effort/time??)

ok brainstorming done...

red_foreman