LOL, talk about rediscovery... Thanks T, now I know what you were talking about in your PM. I think I'll keep this a hobby though.
This is now running for a couple of weeks, and doing okay. One thing I noticed is that if the hoses are submerged in water, the tank water mixes with the micro solution which isn't intended. If I leave them hanging out of the water though, the solution moves so slowly that the drops turn to a black gooey stuff with the flourish, and salt in the case of phosphate.
Solution - I will add check valves to the end of the hoses, and leave them submerged. We'll see how that works.