heya, sorry to thread jump, but about Cal/Mag... I use my well water which is 170PPM - the hardness is calcium, magnesium, and manganese - No iron or chlorine or anything.. anyhoo..

Are my plants using the calcium and magnesium from this source, or does it need to be in a different form for absorption. I haven't noticed any deficincies so I assume they are using it, but are they? I asked this once before but got no answers