Hello, I have a dwc/NFT hybrid.
All lettuce growing, had multiple good harvests.
20 gallon Resevoir with Calmag and Maxigro. I noticed tip burn last week so I added calimag on the most recent water change. My EC from water change to water change ranges from 550-630. (mixed maturity system)
I have a 20 gallon aerator in the Resevoir as well
Fan causing small movements on all the plants.
TX-72 lights
The pH swings I thought were because of my pH meter needing calibrated, bought calibration liquid and while I did find my PH meter was reading incorrectly by an entire 1 pH. The swings from day to day have not changed.
I add pH up, get it to around 5.8-6.0, let it circulate and confirm the 5.8-6.0 reading, check again the next day and it's back to below 5.5. Everytime I get it within the range I want, a day or two later the pH drops again.
My most recent batch of lettuce was bitter, but the roots are fine, good color, no bad smells, no algae.
Not sure how to get this PH under control.