Comment

Comment by Dr. George B. Brooks, Jr. on February 5, 2014 at 9:09am

Great meeting last night (2/4/2014) of the Tucson Aquaponics Project.

http://www.tucsonap.org

Comment by Azwildbill on February 4, 2014 at 8:44pm

My 1st post was - I am looking for a source for chelated iron.  Preferably EDDHA or DTPA which was in the Bright video. He says he buys it at Ace hardware still don't know what product that ace has. My goal is to find a EDDHA with 0 heavy metals. I have found 6% Iron EDDHA Powder  but I don't need a 25lb bag lol .  Thx all for the input hopefully someone knows of a product.

Comment by Jeff S on February 4, 2014 at 2:20pm

Without doing my own research I find it much easier to trust Nate's opinions. He is educated in this field and I feel fortunate to have found his videos. Hope they help you. I'm in Michigan but you Arizona guys are much more active here than the other groups so I stick my thoughts in occasionally.

Comment by John Malone on February 4, 2014 at 12:27pm

From what I've read, the GrowMore Organic Based Iron Chelate 10% is a EDTA chelate, and according to Bright Agrotech isn't a good choice for Aquaponics.

To summarize Bright Agrotech, there are three types of iron chelate:

1. Fe EDTA - common, but not good for AP
2. Fe DTPA - OK for AP with pH less than 7.5
3. Fe EDDHA - Good for all pH levels

Comment by John Malone on February 4, 2014 at 12:23pm

Bright Agrotech's videos on iron

Part One

Part Two

Comment by Jeff S on February 4, 2014 at 10:33am

You guys are making aquaponics too complicated.LOL. I watch the videos from Bright Agrotech and pretty much trust what Nate says there.

Comment by Azwildbill on February 4, 2014 at 10:26am

I was considering Ironite . Here is its heavy metal data sheet.


IRONITE 1-0-1
GUARANTEED ANALYSIS    

(%)
    TOTAL METALS IN PRODUCT    

(ppm)
Total Nitrogen (N)     1.0000                     Arsenic     5.5509
Available Phosphoric Acid (P2O5)            Cadmium     0.1000
Soluble Potash (K2O)     1.0000               Cobalt     <0.3404
Calcium (Ca)     12.0000                          Mercury             <0.0001
Magnesium (Mg)                                     Molybdenum     <0.1000
Sulfur (S)      10.0000                              Nickel               2.0410
Boron (B)     0.0200                                 Lead             <0.1000
Chlorine (Cl)                                           Selenium     <0.0500
Cobalt (Co)                                             Zinc     4.5886
Copper (Cu)          

The symbol "<" indicates the minimum detection limit. The metal was not found at or above the minimum detection limit.
Iron (Fe)     4.5000
Manganese (Mn)     0.1000            
Molybdenum (Mo)     0.0005     Waste-Derived?     N
Sodium (Na)          Micronutrient Fertilizer?     
Zinc (Zn)     0.1000     Phosphate-Containing Fertilizer Material?     
           
           
GYPSUM & LIMING MATERIALS      

Calcium Carbonate (CaCO3)           Magnesium Carbonate (MgCO3)      
Calcium Carbonate Equivalent (CaCO3)           Calcium Sulfate (CaSO42H2O)

Comment by Azwildbill on February 4, 2014 at 10:01am

Metal Content Analysis Information (WA, OR or CA)

My concern is that the water is reused and evaporation condenses the minerals in the water. I don't know If people are changing out a large portion of the water annually. That should be a safer practice. The only other way the heavy minerals leave would be in the fish or the plants.

Comment by John Malone on February 4, 2014 at 7:13am

@Azwildbill

Thanks for finding that information.  It's good to have data. It's even better when I know what to do with the data.

I don't know if 0.5 ppm of lead is significant or not.  We need some chemists to jump in on this discussion.

Comment by Jim Troyer on February 4, 2014 at 4:06am

I read somewhere that molasses is a chelating agent, I use a small dose of it along with Ironite in my system.  Appears to work.  Maybe you can figure out if I'm slowly killing myself, fish or plants by such reckless use of hearsay...

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