Hey Don,
You may have just nailed the reason that sometimes mms does not work.
Through playing with sodium chlorite flakes I found that if you mix it with hard water that the flakes turn to hard rocks and never disssolve. So, it just makes sense that if hard water is in the citric acid then mixed into mms that you stop the process.
In Puerto Vallarta, where a lot of the teaching and exploring go on - the water is soft - incredibly soft, right out of the faucet. So, everything is mixed with soft water.
Thanks, I hope that this fact gets some attention. No hard water, no bottled water ever mixed with anything....only distilled or softened.
Doesn't purified water still have minerals in it? It's the minerals in the water that surround the chlorite and stop it from dissoving.