Can some how help calm my worry that you can't plant with hard water? It seem like my water is 10-12 KH/GH. Should start to think about getting a RO system to soften it? or is it ok to plant. I have plant coming today and don't want to kill it with my hard water.
Don't worry, most plants will do ok in hard water. There are a few species that won't tolerate it.
To clear things up - Total hardness is GH, and alkalinity is KH. Total hardness is not KH + GH since each measure totally different ions. GH primarily measures calcium and magnesium ions. KH primarily measures bicarbonate.