I think it also come from rain water, dust, pollution, fertilizer,air and soil. It is abundant in the environment but i think it leach very easily. That's probably why organisms have adapted to it.
I do understand your reluctance on using it because the excess Cl looks like fertilizer burn. You're plants are getting it even if you don't know it. But like Rick said its abundant in nature and I think that supplement calmax is fine. But If you are asking about the proper levels of Cl. I don't know. But that supplement or tap water has worked well for me.
Maybe you're giving you're plants too little credit on utilizing Cl.
I do understand your reluctance on using it because the excess Cl looks like fertilizer burn. You're plants are getting it even if you don't know it. But like Rick said its abundant in nature and I think that supplement calmax is fine. But If you are asking about the proper levels of Cl. I don't know. But that supplement or tap water has worked well for me.
Maybe you're giving you're plants too little credit on utilizing Cl.
