I just need some math for this one. If I have a liquid hydroponic trace solution that I want to use up that has a Fe concentration of .2% how do I determine how much to add to get a concentration of .4ppm iron in a 250L tank.
It's well known how bad I am at this sort of thing (bad, really bad), but you will need 50ml hydroponic trace solution to add .4ppm Fe to a water column that size.
=.4/2*250
= 50
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