Backyard Aquaponics
A place to discuss aquaponics

"of coarse, that site isnt scientific, it almost looks like it could be a sales propaganda site."

Yav the link I gave you was from scientific research and it has been done a few times with the same conclusion. They actually measured heavy metal levels, exactly what more do you need?

the site i added sleepe.

it seems you totally missed the parts i quoted and the link i put right under your last post, there was even a discussion about part of it.

I was going to ask him his rain PH, but i thought, hmm im in melbourne, my rain is PH 8 usually, so his couldnt be too different seeing as sydney isnt that much bigger / more polluted.

but the dampness issue, that is one i didnt think of and could have real potential to cause harm.

hmmm, I suspect a problem with your test kit, as rain is almost always on the acid side of neutral due to dissolved CO2, forming Carbonic acid, before you add in any oxides of Sulphur or Nitrogen from air pollution, which increase acidity.
Storing it in a concrete tank could turn it alkaline though.

it was probably more my testing method, i tested my tank water (plastic) i think rather than putting a container out to collect fresh rain.

I try not to miss things , the title of the thread asks a question I tried to assist. As usual this has gone six ways from Sunday. I do research for myself and just for fun; if I think its useful I put it on the forum.
Personally I don't give a rats ass whether anyone finds it useful.

Guys.. I was living in total denial and thinking that there was no way that the Zinc would come off, like it was reported..

Now, when I get on the roof, I can SEE that it's fact.. that roof has done serious rust and countless bare patches ..

So, you simply can't have all that bare iron and think that zinc does not come off..

The thing with duckweed is that there seem to be minute plants that get through holes, and the total nuisance is the fine roots that clogs any filtering, but that is now something with which I will choose to accept, for the health of new fish, and the rehabilitation of the clay..
I have no idea about Zn readings.
I saw no point buying a kit (cheaper) whose detection threshold was over the LC level..
..

yes the roots! oh god the roots, but hey, they are 1/10th as bad as azolla roots.

Sleepe, but you did help, i think you may have helped a lot, but it is yet to be seen if fulvic did actually work for me by it also working for someone else.

i didnt mean to hurt your butt or anything, i was just pointing out that i had posted another page with lots of "info" that confirmed what you said, but the page doesnt look 100% credible. :hug:

Might be worth it's own thread but might be nice to work out how to design the perfect flow through duckweed bed.

FULVIC ACID

and suggestions.as.to the BEST.place.to buy it

I would be happy to give it a go.. It reads rather well for both man and beast..
..

It is not all that simple.. IMHO..

I just had the water gently dropping into one end of the bed, and had an overflow that took water from about 1/3 depth from bottom.
This helped reduce solids pickup and floating ingestion..

If I reactivate that bed (easy job), then I will have the return to the nearest. GB. filtered through a wad of polyester insulation ..
The Duckweed has the issue that it wastes Nitrates.. there WAS. A claim that dying weed released Cyanide.. but that does not seem a popular claim..

I think I would like to try the FULVIC Road as I don't have issue with nitrates, but Duckweed would seem an ideal total filtration method .. ie. Excess Nitrates and Unwanted metals..
..
Peter

This is where i bought mine.


http://www.ebay.com.au/usr/green_austra ... 2749.l2754

i wouldnt worry about dying duckweed releasing anything bad, cyanide of all things seems extremely unlikely.

the amount of duckweed i have seen die (and regrow and die) over the years with no deaths in any pond from it, either means that claim is wrong or fish thrive on high levels of cyanide..... i wonder which is more likely.... :ponder:

I tend.to.agree TOTALLY.. but I just report what I read... and I think that I will go back to Duckweed.....
But Nitrates is not my problem..
..

FULVIC Acid.. EBAY.. based on the DE price, that mob is a.serious rip off..

Most ebay sellers are ther to rip you off..

I'll find a.wholesaler with honest prices.. I hope..
..

well i bought 800g i think and used 20 teaspoons at the most so far.

so buying wholesale sounds like you will waste way more money.