If you check the EC/PPM/TDS everyday and watch what changes you can better judge how strong to make it. If the level goes up as the water goes down you will need less nutes, the plants are using more water than nutes. If the nutes go down as the water goes down you have have to increase the nutes. They should go down at about the same level. I am using GH FloraNova and growing Spinach and keep the nutes at about 950-1000 PPM, and check it often. Lately the PPM has been going up, so I will add just water.
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