Thanks for the replies. I would have checked earlier but I don't get any notifications that someone has answered. I flushed them all. Figured better safe than sorry. There was a little nute burn on a few. Trimmed some of the big fan leaves to let light at the lower level. Raised the lights about 10 inches. Lowered the fan speed. Seems something is working as the are looking bettter. And a little cal mag as a foliar spray seems to have helped on the spottting. Thanks again.Ya....your tds is going to read a lot more than just the salts from the nutes in your run off water... itll pick up other solids too.
Run off ppms are not that usefull for that reason...