I have Changed the water. I've set PH to 5.8. I have added the nutrients to get EC about 650mS/cm. Two of them are going great but I have a problem with one. The "triple G's" leaves looks like have been burned by overdose the nutrient. It's wierd because the other gets the same dose. After that I've set EC to 500.After that I started using RO Water i realised that you don't have to use so much nutrient as in hard water. Will see what happens. Any advice?
ArthurStotch, I was thinking the same. Then I took the basket and looked from underneath through the light and I saw the light on the sides. There are many empty spaces where expanded clay touches the baskets wall. I used Rhizotonic. Yes it's organic but producer says that it can be used in DWC