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I tried those on my attempt at turning my flood table into a DWC ala the folks at STG --- the light comes through those boards and I wound up putting black/white film over it. From the pics I see I would seriously be worried about green algae forming in the root zone --- too much light, me...

Thread a bit old BUT, there's some erroneous/left-out info... ...Brick Top gave some interesting info but left out a thing called transpiration pull --- which just happens to be how most of the water/fluid enters a plant --- evaporation is part of that process but imbalanced pressures creating...

I'm very familiar with the material since at one time it was my college major --- the fact is elements are NOT stored in the manner in which supposed flushing would rid them. Again, the elements do not enter the plant and get moved to some storage unit --- it is broken down, acted upon, used...

However, keep in mind that --- the moment those nutes pass through the root membrane the plant's enzymes, amino acids, proteins and such go to work on those ions and convert 'em into polysaccharides, organic acids, sugars, more protein and other minute stuff. There's no nitrogen, no...

Thank you so much Samuel --- I get a bit tired of all the myths floating around these sites. Most growers would do themselves well to simply study and become familiar with plant metabolism.

No challenge....did your stems turn purple/red?

Over-watering? Once every other day at the beginning? The tables in other locations don't have this problem and we hit those 4 to 6 times a day --- and, the Grodan scientists tell me that you really can't over-water rockwool. The minute it's completely saturated it contains 80% solution, 15%...

You're right --- the roots are grossly underdeveloped and while that would certainly effect nutrient uptake that uptake was lacking from the beginning. Trying to figure out why.

No takers?

Thanks for the link --- you're probably right about the deficiency --- the plants exhibit deficiencies all over. But it seems the nutes have an adequate supply so it probably is some type of lockout-lockup.

Mechanicals: room-8x10x8; lights-2 1000w MH bulbs in cool tubes attached to convertible ballasts; ventilation-8” CAP exhaust fan 745 CFM attached to 8x24 Phresh filter --- goes through the light tubes and out the roof, 1 16” oscillator across the table from the end, 8” floor fan rotated towards...