co2 burn

what are the signs of co2 burn?
I have been having problems with my controler. It has been drainning a 50lb bottle in a week, but says the PPMs are at 1500ppm.
my nutes are good temps are good and PH. but I am still getting some yellowing on a few leaves and leaves are not as dark as they should be.
also have some leaf droop. plants are healthy other than these mild issues.

Too high of CO2 levels will cause chlorosis or necrosis of the foliage. Chlorosis is when the leaves begin to turn yellow (similar to lack of nitrogen...but not in the good way),you will also notice it working from the older foliage to the younger foliage over time. Necrosis is when the leaves begin to turn brown/black (die) starting at the tips.

Neither is good for any garden. the way I see it you have 2 options. They are; replace the controller, or stop enriching your garden with CO2. Your third option is not to listen to the first two options, and use your current plants as fertilizer for your next batch.

Peace and big buds,

thanks co2 is stopped till I can figure this out.