Using General Hydroponic Flora Series nutrients right here in regular ol' city tap water(120-140ppm, 6.5-6.7pH) mixed right away without sitting overnight and straight into the reservoir. However it is to be noted that I do use GH FloraKleen(5ml/gal) in between rez changes which occur every other week for me. I top off with filtered tap water and the occasional 1ml squirt of pH down in the meantime to keep levels in check.
Recommended pH, Nutrient, and Temperature Levels
pH levels:
Rockwool - 5.6 to 5.8
Coir - 5.8 to 6.0
Hydrotron - 5.8 to 6.2
Anything lower than 5.6 results in nutrient lock-out in any medium.
Reservoir temperature:
68 degrees Fahrenheit (given a 72 to 78 degree lights-on room temp and a 65 degree lights-off temp)
Nutrient levels:
Note: Amounts will vary according to what stage in the cycle you happen to be at.
Clones - 200-400ppm AFTER roots appear (nothing before that)
Veggie - 800ppm, although can go aggressive and boost to 900ppm once the plant is well established.
Bloom - 1000ppm for the first couple weeks, then boost up to 1200ppm for almost any strain.
Mixture Ratios for General Hydroponics Flora Series Nutrients
Note: Amounts listed are per gallon and should be mixed in the orders given.
Clones and Seedlings - 2.5ml/gal of Micro, Gro, and Bloom
Vegetative - 5ml/gal Micro, 10ml/gal Gro, and 5ml/gal Bloom
Early Flowering - 7.5ml/gal Micro, 7.5ml/gal Gro, and 10-12.5ml/gal Bloom
Peak Flowering - 10ml/gal Micro, 5ml/gal Gro, and 15ml/gal Bloom.
Flush - 2.5ml/gal of Micro, Gro, and Bloom for 3 days, then plain RO or de-chlorinated water with 1 tsp/gal (2.5ml) of molasses.
**Special thanks to oldgrower on another related forum for all of the super helpful info above!**