Yes. And DTW is the easiest manage your PH. My favorite way to grow is with hempy buckets and measure the runoff. The RO will tell you how to tweak the feed.
My 2 cents worth. A 6x6x6 block can easy weight over 6 pounds soaked. You want to let them dry back to 2 or 3 pounds so your roots have to go to work.
If you want to re-water the blocks, you can take a lot of water out of the block by sitting it on top of another block. The moisture gradient...
I think you will have to water multiple times a day for a plant of any size. With one plant in a 2x4 foot tent, 3 liters a day, or more, is not unusual.
Just a thought...do you think the weekly flush brings the average EC down a bit?
But it the end, the plant always has the last say.
And if your in/out are close and your tips aren't burned, then you have a happy plant that can take 1.8!
I have bought and DIYd several Waterfarms. They are beautiful in their simplicity and function. And a great "tweak" turning them into a DTW!
Two more questions...what do you use for a res. pump timer? And what have you seen/smelt/tasted using the BioAg CytoPlus? Thanks.