I have not told you the daily ppm, (parts per million) of my nutritional solution, because it would not really help you with your grow.
If you use a ppm (TDS - EC) meter, you should first read and follow the instructions on your nutrients.
When I first got started with this grow, I started with 1/4 dose nutes to be safe. A day or two after I saw the second node or 4th leaf, (two sets of two leaves, not counting those first two round leaves), I introduced 1/4 strenght nutes. I increased them to half strenght, or a 2nd dose of 1/4 strenght nutes two days later when I saw the 3rd node. I could safely do this with the Stealth Hydro Nutes. They are not too strong to cause damage at that strenght, especially using CFLS to grow. HID light users can use higher NPK nutes, or stronger strenght nutes.
A day or two later, I saw a 4th node, and increasing the strenght of the nutes again by adding another 1/4 dose, bringing me to FULL-Strenght nutes.
That is when I measured my ppm, but by then, the plants were eating the nutes too. My ppm was only 200 then, and 75 to 100 of that was my well water. In no way am I saying that is what your ppm should be too. I am just telling you what mine was. I was trying for a weaker strenght feeding to make sure I did not burn them up and be emabarrassed. In past grows, I did use more nutes, strongers doses, more often.
After ten days passed, I did a Drain and Replinish. I added back a full dose of nutes and my ppm was 280 that day, telling me my target ppm to stay at the same level during the early VEG or GROW cycle.
As I daily added a half of gallon of water, and a 1/12 packet of nutes, my ppm grew to 330, or bounced between 220 and 340 as they ate. (Before the feeding, it was 220, after the feeding it was up to 340)
By the time I was in my 3rd week, and they were drinking a full gallon of water a day, and I was adding back 1/6 dose of nutes, my ppm was between 360 to 440 daily. But that number is not important to me or you. What is important is tracking it, writing it down daily, to determine how much more nutes I should add or not add.
Let me rephrase this.
Do not worry about the exact number, or any number from a chart or from me and my grow. Instead watch, record, and track how it rises or falls from day to day. The differences between what you have in there on one day, and the readings you get the next day will tell you how much your plants are eating. Of course, you do this daily, at the same time of day.
And remember, just because a gallon of water is gone, does not mean they also ate 1/6 of the nutes. Maybe you had HIGH HEAT and they were very thirsty but not as hungry.
First, determine the ppm of your water sourse. Say it is 100 ppm. Then fill the tank with the proper amount of water and a complete dose of nutes and read the ppm. Say it is 350 for example. If tomorrow a gallon of water is gone, and the ppm says higher than 350, or is still close to 350, then they did not eat and they do not need more nutes, they only need more water. Your reservoir's water and nute solution is more concentrated, telling you to add more water only.
If the ppm went down to say 250 from 350, and a gallon of water is gone, they need a gallon of water, plus enough additonal nutes to bring the ppm back up to 350. And that is the real purpose and use of a ppm meter, to determine that need and how much.
No one can tell you what your ppm should be. It will vary from garden to garden, and vary from different nutrients too.
If your plants are very happy, and drinking and eating at the same level, then the ppm will remain the same daily.
If for example, 1/8 of the water is gone, and 1/8 the nutes are gone, then the concentration remains the same and the ppm will remain the same.
I would like to offer a ppm chart as a rule of thumb or ball park target ppm, but each grow or garden is going to be different.
These numbers are based on EC readings, .500 readings, TDS readings converted from EC or the common Hannah Chart:
Seedlings, Early Sprouts 100 to 250
Early Vegging 300 to 400
Full Vegetation 450 to 700
Early Blooming 750 to 950
Full Mature Blooms 1000 to 1600
(this excludes the ppm of your water)
According to the chart, I am under feeding them and my grow could handle a stronger dose of nutes. But I am playing it safe as an example and as a demonstration.
My grow is 28 days old today, from seeds being introduced to the system, until today. My Bucket Grow plants are 22 inches tall and the oldest tank's plants are 20 inches tall. the 2nd tank's plants are 18 inches tall. I am very proud and happy with that growth.
I admit I normally push them harder, but playing it safe has been much easier.