I just finished my first grow, and I used 2 x 600W Viparspectras and RDWC.
Started with 4 seeds. One didn't sprout and another turned out to be a Photo.
From the 2 remaining, the first yielded 130g dry (62%). (link to the journal is in my sig)
The second (a week later) is currently being harvested, but the buds are much denser, so I think its going to be a good bit bigger.
I used the full line of Remo Nutrients, Great White Myco, Atamai Ata-clean (when I remembered about it - 8 weeks into the grow I think) and a Silica Additive.
Here is a few things I learned on this grow:
- Make sure to have pH up and pH down - I had one large issue when I ran out of pH down and had to go a week using vinegar and Lemon juice to try and control my pH - Vinegar and Lemon Juice last NO time in RDWC as a pH adjuster - I was adjusting 4 times a DAY (turns out my bottle of pH down was sub-standard - I was using 30ml++ per rez change to set the pH. With the replacement bottle I bought (same brand), I was using 2-3ml).
- Get a GOOD pH pen (bluelab highly recommended) and EC meter. A cheap-ass pH meter will screw your grow in RDWC.
- Write EVERYTHING down. Good notes recording pH, EC(ppm), Feed volumes used at rez changes (plus any you add due to deficiencies etc), LST, defoliation, rez topups etc etc. With this you can keep track of your EC /pH and know WHEN to decrease and increase feeds.
- Alongside [HASHTAG]#3[/HASHTAG], use this chart:
- Keep on top of the rez temperature. This will boost root growth and reduce the risk of Pythium.
- Give a light dose of CalMag right from the start using LEDs. I had a calmag issue on one plant in the first 10 days.
Apart from one or two minor issues, I was really happy with the grow and had no issues with 'the complexity of DWC'.
I actually much prefer it over what I have read about soil/coco.