Ok, let’s get started. So that I don’t write all over the place, I’ll just write down how I proceed step by step. I’m sure you already know a lot of it.
Soaking:
Before I use the rockwool, I soak it for 24 hours in a nutrient solution with an EC corresponding to the size of the rockwool cubes and the plants and a pH of 4.5 to 4.8.
After these 24 hours, the pH value should have risen by approx. 1.00 and thus reached pH 5.5 - 5.8. After you have removed the nutrient solution and drained the cubes or slabs, they are ready to be stocked.
With this procedure, I always have perfectly prepared substrate, regardless of the stage of the plant’s life. Some people think you don’t need to do this, but I’ve been doing it for quite a while now and it works well.
I think most books also describe this as the standard procedure for rockwool. I recommend not skipping this step.
Finding the right EC:
It can be as easy as making coffee. Or as difficult as keeping a cold fusion going. Joking aside ! 
The easiest way to prevent salt buildup is to find the right EC. Let’s just say we give the plants an EC of 1.2 and the drain is also 1.2 at this point everything is perfect!
After 24 hours I measure the drain again and if the drain has risen noticeably I reduce the EC in the tank by 0.1 - 0.2 and check the drain again after 24 hours. Whether it is rising, falling or has reached equilibrium. I then correct the tank accordingly, but always in small steps. This has actually always worked so far and is easy to implement on rock wool and in the hydro area.
And should be independent of the nutrient profile. That’s another story in itself! Just like the influence of phenos ect. bla bla bla
Oh shit I have to flush:
Everyone knows it, you have everything set up perfectly and everything is going great!!! Until the day your ec meter tells you: “Bro your drain has an ec of 1.6” and you think to yourself hmm actually you should have 1.2.
These are all just examples of EC values, the real ones can of course look quite different! However, the procedure is always the same. First of all, always rinse with a pH in the range of 5.5 - 5.8!!!
And it should be clear that flushing always means Drain to Waste or Drain to Garden! That is why it is so important to find the right EC value so that you do not use too much consumable material.
If the EC is a little higher, I flush with my preferred EC value until the drain reaches it. In this example, until the drain is back to 1.2.
If the EC is quite high, I prepare a tank with half the EC value of my desired EC value, in this example Ec 0.6, and flush with it until the EC reaches 1.2 again.
These two variants should always be sufficient for flushing if the EC is well adjusted.
Irrigation:
Here I think opinions probably differ widely. Which is perfectly fine, as no two setups are the same and I would never say that this or that is the best solution.
There are simply too many variables that affect the plant’s water balance.
I avoid ebb and flow with the very large cubes (15 x 15 cm) and with slabs (100 x 15 cm). Drip irrigation is preferred here as, in my opinion, this is what they were designed for. (just my personal opinion)
With the (7.5 x 7.5 cm), on the other hand, ebb and flow works quite well, as the cubes keep changing position on the table (or tray or whatever serves as a base) during the vegetation phase. Here, drippers would only interfere with handling during operation.
I usually immerse my 7.5 cubes in a freshly mixed bucket of nutrient solution until no more air bubbles rise in the bucket. Then I pull it out and let the excess nutrient solution drip off into a second bucket or in the sink. now the cube is saturated and should not need any further watering for between 12-24 hours, depending on the size of the plant and the outside temperature etc… This can of course vary…
Let’s come back to the 15x15 cm cubes in which I keep my mother plants. I also immerse these cubes in a bucket of nutrient solution as described above. However, I only do this every few days or once a week. For me, this is enough to keep everything healthy and alive without the cubes drying out. I have relatively few watts above my mothers, as I don’t need huge quantities of cuttings.
If I now offer the mothers more light and more watering during the day, then I have to throw away a lot of cuttings every week. Everyone has to find the right interval for themselves.
Phew I’m just looking at the monster I’ve created… Like I said I’m not good at writing long texts I hope this helps at least a little!!!If things are unclear or I have expressed myself incorrectly just drop me a DM.
Onslaught of positivity incoming 
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