I have lots of plants and orchids growing in my home, and every other day I have to make a soluble fertilizer for them. I use nitrogen, phosphorus, and universal fertilizers. I was wondering if they are safe enough, sometimes when I water my plants some of the fertilizer gets spilled on my hands. Should I be concerned? I try not to touch dry fertilizer when I dissolve it in water, but what if I inhale it? I'm exposed to it so often, so I thought I might ask if I am in danger. Thank you.