I have been asked a question regarding CSM+B and yellow water.
I have never seen yellowing of water beyond concentrated mixtures, but I use a lot of peat in my substrates so it is possible this is common and I just have not noticed or am not sensitive to the discoloration.
Another possibility that occurred to me was lighting, my lighting is in the sunlight, high ambient and 5000 k to 9325 k ranges, those ranges may tint the water differently.
A suggestion had been made regarding a change from EDTA to DTPA chelate. I just do not understand enough to know why EDTA would discolor the water and DPTA would not. I have used both and I do not recall a difference in water color.
I think I recall reading something about certain water types reacting with CSM+B.
Any thought would be appreciated.
The first sign we don't know what we are doing is an obsession with numbers. - Johann Wolfgang von Goethe
Disclaimer: I am not trying to make you mad, it is just what I am, an evil plant monster, 'nuf said.
- I believe the information I am giving is sound, I am not a veterinarian, professional chemist or particularly bright and certainly not a "Guru.".
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- When in doubt "don't."
Looks like I'm not the only one dna has been messaging.
EDTA disassociates from Fe much more easily at higher pH values. I've heard below 6pH is ideal. I'm guessing the Fe EDTA turns to FeO, which has such a nice color that it's used as pigment. The same thing would probably happen if DPTA disassociated as easily.
Quit peeing in the water, it'll stop turning yellow.
ETDA is poor at higher KH's, use DTPA
same reason as yellow snow.
Mustn't pee in tank, mustn't pee in tank, mustn't...
Well, there is the whole cat litter approach.
Using cat litter as a sediment base, then the cat goes in the tank, this fertilizes the plants, and no need to dose.
I do not think ETDA will yellow the water really.
DTPA is more red in color with some yellow.
We only add a little so I do not think there's much if any color effect our eyes can pick up, if you dosed say 100mls per 80 liters of tank, then sure..........
So I just looked down a 12ml test tube containing 1.5ppm Fe EDTA and my 7kh tap water. Even with only about 5.5cm of depth to look through, the water in the EDTA test tube is more hazy, with a slight yellowish-brown tinge to it.
I've got a 500ml solution of 1.5ppm FeEDTA in local tap water sitting to disassociate further; in my observations of the tanks I dose, it takes a few hours to become more noticable.
If the effects don't match the tank water by tommorow, then I'll start looking to my aquasoil for tannin leeching, and testing it.