Originally Posted by g8wayg8r
Any articles at the tip of your mouse regarding sulfate or chloride build-up over time. I know plants will use the nitrate. I'm not sure about sulfates or chlorides.
The KCl may do the trick.
Plants use both sulphate and chloride ions. The ions possess a negative charge (CL-, SO4
-) and are used to balance all the positive nutrient ions (e.g K+) inside the plant.
This is what I quickly found on another site...
I guess the other major issue is chloride vs. chlorine. Chlorine is the element, it is a strong oxidzing agent, when dissolved in water at around neutral pH, it is largely in the form of hypochlorite ions, which you may recognize as the active ingredient in bleach. Chloride ions are essentially unreactive. It is the major anion in seawater, but usually it isn't the dominant anion in freshwater, or it is about as abundant as sulfate or bicarbonate.
Some fish from very soft water may be somewhat susceptible to high Cl-. Generally, though, at low concentrations, it is completely innocuous. I doubt that there will be enough Cl- buildup from the use of the fertilizer that you mention to cause problematically high Cl- concentrations if you perform even occasional water changes.
Weekly water changes will ensure that no values build up too high, but unless you are pouring kilos of ferts in, I agree that it wont really be a major problem.
One thing to watch with KCL, is that you get it is as pure as you can find.... try not to get a sample with lots of additives as well.