I mixed a fresh batch of nutrient stock solution, I make up a healthy batch of 8 gallons at 200g of my 5-11-26 per gallon, a total of 1600g. The directions say to mix up enough to last at least a couple of weeks, this to ensure that any settling or stratification in the bag won't affect the final mix. I used to do a hundred grams or so at a time and it made my micros weird and inconsistent from batch to batch. Doing larger amounts has solved that problem; amazing what actually reading the manufacturer's instructions will do for you!
So now I know that if I use my half gallon scoop, I'll get 100 grams of mix. Easy peasy. The rest of the dry nutes don't need to be mixed into solution ahead of time because they're just one nutrient salt at a time.
My current late veg and early bloom mix is a ratio of 2.5 parts mix, 2 parts calcium nitrate and one part epsom salt.
To fill a reservoir of three 27 tuffboxes from empty, that's 250g, 1.25 gallons or 20 cups of stock solution, 200g of calcium nitrate and 100g of epsom salt. Conveniently, most of my reservoirs are some multiple of 3 tuffboxes.
The 3 plant RDWC is now ready, as is the pair of 3x3 flood tables.
As soon as I catch my breath and get a bite to eat, I'll be moving a bunch of girls around into their new homes. Pics to follow!