SRAC Fact Sheets. Aquaponics and the Wonderful Worm. This past Friday, Joanne (a fabulous lady who works part time on projects with us) and I spent an hour and a half picking through 75 liters of Hydroton that was in the last of the AquaBundance grow beds on our deck.
This was the second grow bed from our two-bed AquaBundance system development project and it was not going to make it into the greenhouse for the winter because of space constraints. The Hydroton was going to be stored outside for the winter. Deep Sand Beds. By Deirdre Kylie What is a deep sand bed?
A deep sand bed is a sand substrate coupled with bacteria and multicellular organisms working together as a powerful biological filter. Originally developed in the saltwater aquarium hobby, deep sand beds (DSBs) extended the biological filter from converting ammonia and ammonium to nitrate, to eliminating nitrate by denitrification - using the oxygen in nitrate, releasing harmless nitrogen or nitrous oxide. This was desirable because of saltwater organisms’ great sensitivity to nitrate.
In freshwater, nitrates are much less toxic, requiring infrequent water changes to control levels, but the freshwater DSB as described in this article does more than eliminate nitrate.
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