Hey there Mr. Smith!
Yes, it royally blows how much medium it takes for this system. You are correct. I think I mentioned that as a "Con" on the review I did. The other possible disadvantage is just all the movement of water - it would be easy to flood your grow space if a hose isn't connected well to a fitting, etc.
I love DWC, and the under current style you are doing is one of the coolest hydro systems going in my opinion. I've been dying to do a run just like the one you're doing now, and I'm thrilled to see you doing it. I've been saving kitty litter buckets up, and still want to do it someday as I like experimenting a lot like you do.
But, I see nothing about the Flo N Gro (yet) that makes me feel like I NEED to try anything else. Growth has been vigorous, and they've been the picture of health since I put them in the system. Roots are bone white.
What's not to love? Oh yeah, all that *&%$*&!! hydroton. That does suck, but may be worthwhile for how smooth it works otherwise. Ugh, I hate rinsing it too. What a pain! It ain't cheap for that much of it either...
Great tips on defoliating along the main stalk to reduce stretch and encourage lateral growth. Makes so much sense!
I really like that DIY Gravity drain controller you made. I most definitely will keep that in mind if I start vegging separately. I have some ideas on that but they may have to wait a while. Right now, space and stealth make that difficult.
Great post, Mr. Smith.
First, I do have to agree that Mr. Smith is one of the most innovative hydro growers I've had the pleasure to follow!
Next, just a suggestion, but I recommend you buy a bag of STG hail and try it in a bucket or two on your next grow. I've been real happy with the way it's performed in the waterfarms (just stay away from their starter cubes!), and it's very light-weight (good for your back!), and doesn't need to be pre- rinsed/soaked. You may find it worth switching!