I know that my water is going to be too high but I want to be sure what it is. So how an I test it? Is there test kits at local hardware stores that can do it or do I have to buy one the ones you would use to test R/O water? Should I be testing for anything else then TDS? What is the highest it can be for it to be ok to use for daily watering? I of course would flush them with R/O water every now and then.