your res last a week ?Just a note about the epsom salts. I use it in a foiler spray with just a pinch or two and it works wonders to clear up mag deficiency very quickly. Also i use a level tablespoon for 25 gallons in a flood and drain to keep it in check. Not sure as I'm a newb but start off light as not to do any harm.
Well it depends, i can get away with 2 weeks at start and 5-7 days near end of flower. 4 plants in each tray. There was a table somewhere that I used that measured by weight not volume.your res last a week ?
so 3 teaspoons for how many plants ?
1 teaspoon in a gal of water for feeding 5 plants should be fine