As far as the Arizona Gardens article goes, it is what I would expect from an organic proponent of managing a ponds and shows a bit of dishonesty by not sharing the potential negatives of the approaches.
The article is correct in that Barley produces hydrogen peroxide, but it also provides complex organics for bacteria to decompose which further depletes the inorganic carbons, oxygen, and minerals in the water. The better approach would be to use a high frequency, very low concentration, very low dose measurement of hydrogen peroxide. The ironic part about barley, when I tried it out, there was actually algae starting to grow on the barley. So, it just one of those products pond stores are trying to make money off of from their customers.
I am glad to read how the author writes more careful about the usage of hydrogen peroxide. Folk can easily over dose with hydrogen peroxide significantly hurting or killing fish and plants. So, if there any desire to use it, then I highly recommend obtaining and using a
low concentration hydrogen peroxide test kit so to make sure the peroxide does not linger around for more than 12~24 hours; if it does, then either a water change or toss in some sodium thiosulfate crystals to nuetralize the peroxide. To understand more about sodium thiosulfate (ST), then read my
post#17 in the thread adding water. Simply just dissolve a handful of crystalls in a bucket of water then dose the water. Any leftover ST is broken down by bacteria and into fish/pond/plant healthy sulfate residuals. The dosage rate the article mentions for the peroxide is quite high so I would be careful with it. In the beginning, just to see how it reacts in the pond, I would do half his dose at first.
It is funny that the author would recommend hydrogen peroxide yet rails against using algaecides, since most algaecides are just an oxidizer or a microbicide.
I would be extremely cautious about the articles comments about salt. To actually accomplish what the author suggests, the concentration would have to remain quite high. To get a better idea, then read
is salt healthy for the pond?
Overall, I think it is a decent and typical article and one of the more will mannered articles I have read. The references to the various fish options are quite interesting, which I think I will look further into.