RDWC + LED = Garden of Eden

@Jonkomaster,Yes, PH from 6 to 6.5 in one day is ok. I used to have wild PH swings, from 5.5 to 6.8 in 6 hours. If your water temps are over 16C, you must use Hydroguard or other beneficial bacteria to avoid getting pythium or root rot. I had huge problems with pythium because of the high water temps. The dust from the clay pebbles is fine, it won't affect your plants.

@grower_not_shower, Yeah I;ve heard they drink a lot in flower. Yes I have a huge carbon filter for 1500 cc to avoid any smell problems. Is it normal the ph goes from 6 to 6,5 in a day in the current phase? I didn't know I had to clean the hydro granules so just added them to the buckets, so a bit of the dust is now sitting on the bottom of the buckets. Will that be okay? I'll flush the whole system before going into the flower stage tho.

@Growingkitten, I'm am very inexperienced with growing and especially RDWC (first timer!) so I'm not sure what I can say about GHE. I sure don't have any complaints ! Everything is going really well and I'm totally in love with RDWC cause: - no bags of soil - no bugs (also cause I grow from seed ofcourse) - EC/PH easily measured