smatthew

Members
  • Content count

    129
  • Joined

  • Last visited

About smatthew

  • Rank
    Senior Member
  • Birthday 10/12/79

Profile Information

  • Location
    USA, CA, SF Bay Area

More Information

  • Interests
    Aquaponics
  1. Gary - what did that political rant add to this discussion? You yourself note that it is "Completely Off Topic". Unless you mean someday our aquaponic systems will lock us out of them unless we have the dealer come service it.
  2. First off - it sounds like those were comments made by an independent certification agency, not by a USDA official. They do sound accurate though Why is feeding fish "organic" feed pointless? If feed manufacturers can make a nutritionally complete plant based feed, then more power to them. BTW - If feed manufacturers waited for the USDA to change the rules re Organic fish before developing a product, then they would be behind the competition when it did happen. And let's not forget about other countries. Doesn't EU have organic aquaculture regulations? I'm not sure where you got the phrase "USDA unclassified". Organic rules are very clear about manures - All manure is eligible for use in organic production, unless it contains excess heavy metals, or residues of prohibited substances.
  3. I'm confused - what comments from USDA prove this?
  4. NOTE FROM ADMIN This post has been deleted. Please see post #111 above. Thank you for your cooperation.
  5. And i assumed it was a cheap shot because the whole purpose of this thread was about ensuring adequate biofiltration, i.e. keeping TAN low.
  6. don't feed the trolls.
  7. Yes, I am familiar with slow sand filter tech. Which is not what we're talking about here. We're also not talking about fluidized beds either. We're talking about reciprocating sand beds. PS: Is thought moderators were supposed to be above cheap shots about animal cruelty?
  8. Not in my experience. I've seen quite a few "other" media beds, set up on 15flood/45drain cycles that were not able to achieve adequate biofiltration.
  9. Yes, but a "XXXX" media bed (anything but sand) can be run Constant Flow and achieve adequate biofiltration. Sand beds need long "dry" times to keep the plants happy, so no constant flow there.
  10. The point of this thread is 1) You can never have enough biofiltration 2) Sand Beds provide filtration, but an individual sand bed is only capable of so much filtration 3) Having multiple sand beds, or an external constantly running biofilter, will improve water quality
  11. Sodium does nothing in regards to Nitrite. It's Chloride ions that assist there. And Chloride ions come from Calcium Chloride just as easy as Sodium Chloride. using pH to manage ammonia works, until something happens.... pH swings, and fish start dying. It could easily be a late afternoon phytoplankton bloom taking up all the dissolved CO2, pushing the pH to 10. Most aquatic systems experience diurnal shifts in pH. Even if only a small percentage of the ammonia is present as NH4+, it still hurts the fish over the long term. BTW - I understand your concerns about MBBR's causing maceration of solids. How do you feel about bead filters? And/or Sponge filters?
  12. And the extra head means higher pumping costs for the life of the system ;-{
  13. I think we want the solids chewed up on the way to the sand beds. If we're running a biological filter on a separate loop, we don't want the solids chopped up there, since they would just end up back in the fish tank.
  14. I agree that more beds is the optimal solution. For the most part, i dislike mechanical filters. The need for maintenance is a bugger. However, if you're using a backwashable filter...... then you're golden. For instance, a bead filter is a very efficient biological filter, and it traps solids like a champ. The downside is the amount of water needed to backwash. In a sand-bed based system, that's no longer a problem! Just send the backwash water to sand-bed. You could even automate the process if you wanted. In my mind, one of the huge benefits of a MBBR is the intense aeration & degassing that occurs. According to Dr. Timmons, water from a mid-water or surface pickup will have minimal solids in it and should be acceptable for a MBBR type filter without pre-filtering. A completely air-driven MBBR would further reduce solid fragmentation issues.
  15. I created a topic - moderators feel free to move things around...