GPSFrontier- Thanks for all your posts, they are very helpful. I'm a newb to both gardening as well as hydroponics and am just about to plant my first crop in my freshly-built 11 bottle setup (probably peppers & maybe lettuce), but isn't TDS one way of checking the
nutrient solution?
If so (I'm still reading & learning) I found out that Harbor Freight tools is now selling a very inexpensive TDS meter and have bought one but not used it yet. I'm sure it's not up to the standards of more expensive ones, but as a newb I figured $17 was a gamble I'd be willing to take in case I can't grow anything! Their item number is 94759 and the specs are 0-999 ppm and 5% accuracy, for what it's worth. Now I just need to learn how to use it! :-)