P
phill93
- 27
- 13
I am at my wits end. I have been using coco coir/perlite for years and recently went over to rockwool. Everything went great up untill 3 days ago when I noticed that the PH was drifting upwards (runoff 6.2, input 5.6) I also noticed that the resavoir ph would climb to 6.1 or 6.2 over night even though the tenprature stays constant at 19c. I was using tap water and figured that there was some sort of reaction happening between the nutrients and the elements in the tap water even though the EC is only 0.3. I bought a RO filter and switched to RO water, after I've put in the necessary nutrients the ph sits at 5 and I use I bit of Ph up to raise the ph to 5.6 and there aren't any more fluctuations. Here is my problem:
The plants are in 4 inch cubes stacked on 6 inch cubes stacked on 8 inch cubes. After irrigation my runoff comes out at 6.1-6.2 even after I've put a couple of gallons of nutrient solution through all of the plants. I'm worried that the ph swings might have made the rockwool more alkaline which is pushing up the PH. The plants appear to have a light iron or sulpher deficiency I attribute to the ph having been on the high side. Are the blocks ruined? Should I flush them with nutrient solution again? I was under the impression rockwool had a CEC of 0, will flushing more bring down the block ph? These were cuttings from mother plants that I killed after a recent reset so I would like to get them 100% healthy before taking cuttings from them. I've attached two photos.
The plants are in 4 inch cubes stacked on 6 inch cubes stacked on 8 inch cubes. After irrigation my runoff comes out at 6.1-6.2 even after I've put a couple of gallons of nutrient solution through all of the plants. I'm worried that the ph swings might have made the rockwool more alkaline which is pushing up the PH. The plants appear to have a light iron or sulpher deficiency I attribute to the ph having been on the high side. Are the blocks ruined? Should I flush them with nutrient solution again? I was under the impression rockwool had a CEC of 0, will flushing more bring down the block ph? These were cuttings from mother plants that I killed after a recent reset so I would like to get them 100% healthy before taking cuttings from them. I've attached two photos.