You want to measure the nutrients exactly not just guess or close.

You mix up the nutrients to the strength required for the cycle of growing the plant is in. You then fill the pot and let it drain. End of story. Check it in a few days when it's dry feed it again. Empty the catch pot (the one you used to catch the run off) before you water again. Roots will reach that lower pot in no time. The imbalance of nutrients from feeding to feeding can be a problem.