First let's start with the nutrients I like to use with coco coir and how I go about using them. I currently use MasterBlend Tomato & Vegetable with Calcium Nitrate and Magnesium Sulfate. It is a complete profile and can easily be adjusted. Other comparable nutrients with similar profiles are Jacks, or Chem-gro.
Elemental PPM Profile
(MB Tomato & Veg/Calcium Nitrate/Magnesium Sulfate) 2g/2g/1g at 5g total per gallon
I like to make 32oz A & B stock solutions because it is easier for me to administer liquid with a syringe in to gallon jugs instead of weighing powder.
Stock Solution A(Masterblend/Magnesium Sulfate) and Stock Solution B(Calcium Nitrate) are used at a 1:1 ratio
15ml per gallon of A and 15 ml per gallon of B are what I use. That mixes up to about 1.3EC(650ppm) in RO water for me.
Here are two 32oz containers(measured) with Reverse Osmosis water(Distilled is preferred) and all the components weighed out:
128g Masterblend and 64g Magnesium Sulfate + 32 oz water = 2gMB/1gMagsul per 15ml.
128g Calcium Nitrate + 32 oz water = 2gCalnit per 15ml
First add the MasterBlend component to container A while trying to pour it as close to the water as possible to avoid a plume of fertilizer dust. Agitate ever so often with a plastic spoon or paddle of some type until it completely dissolves. I used a plant marker. Of all the components this takes the longest to dissolve which still is not very long.
Now add the Calcium Nitrate to container B. Either rinse or use a separate plastic spoon/paddle to agitate so that it completely dissolves.
After MasterBlend is dissolved it is time to add the Magnesium Sulfate to container A. Agitate it with with the mixer a few times until it completely dissolves.
Here is the completed Stock A & B solution.
Once again the recommended strength is 15ml A and 15ml B per gallon of water. ALWAYS add A first, mix and THEN add B.
What is the point of A and B? Why don't we just mix everything in one bottle? Of course control over Nitrogen and Calcium is one reason but the other even more important factor is avoiding PRECIPITATE. Has anyone here ever tried to get Maxigro, Maxibloom, Vegbloom, or Megacrop to completely dissolve and notice it is near impossible? That's because it is not a good idea to combine magnesium sulfate and calcium nitrate in one bag. When Calcium Nitrate and Magnesium sulfate come into contact at high concentrations in water at the same time they form Gypsum. In other worlds an unknown amount of calcium and sulfur drop out of solution.