Originally Posted by Aheartlessfish
do you keep your solution at room temp? i heard keeping it at room temp = you have to adjust the dosage some how...
i dont plan on putting my iron in the fridge...stuff is poison if someone accidently drinks it
You can make a smaller amount of mixture so it doesn't stay bottled at room temperature for many months. I have many tanks and a 500 ml bottle only lasts for a month. Whatever oxidation that occurs should be minimal and insignificant for healthy plants in a home setting. It might be significant for large scale commercial nurseries or laboratories.