Are you using the FF product line? As long as you follow the usage rates for whatever it is that you're using you shouldn't really have any problems. I doubt many soil growers regularly check EC/TDS; some don't even regularly add anything to the water at all.
Are you using the FF product line? As long as you follow the usage rates for whatever it is that you're using you shouldn't really have any problems. I doubt many soil growers regularly check EC/TDS; some don't even regularly add anything to the water at all.