I just do not buy that. The lfs here routinely drains a tank and heaps the sand up until the majority of it is dry, and then scoops it out and puts it in a drum or buckets. SOme sticks to high heaven....but its sure not ruined by any stretch of the imagination. For as much as sand costs especially aragonite based, its a sin to throw it away just because it needs a bit of rinsiing and cleaning. At the owrst even if it was all dead and full of nitrate nitrite and phosphates and mody
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remains, a rinse in water be it chlorinated or rodi or salt will remove virtually all of the organics that make it smell, and then placing it in thr tank and initiating a cycle will finish off what the rinse did not complete. Oh and BTW the lfs here has some of the ost beaautiful tanks around most of them created and recreated with sand reclaimed months and weeks after a tank was broken down or reclaimed for one reason or another. They often buy used tanks / etc from folks (really steal em for what they pay for them) and about all they do is put the fish in the tanks to resell along with the corals and liverock, drain out the water, scoop out the sand and "SAVE" it as well, clean tank and sell it along with accessories......Sand just does not wear out or become unuseable from being smelly or setting dry or even in stagnant water. If that was the case then the live rock would be in the same boat that sets around for days and weeks on end as well or even rock that is shipped........Rinse the swand and reuse it, At the worst yu'll have a sand bed without any life but still viable and ready to be seeded from live rock or a cup or two of good live sand or some live rock......and be $$$$$ ahead in not having to pay the prices they ask for sand in lfs's. Odds are by the time a tank is cycled that sand will be ful of life as any other live sand would be .