Tim, can you go through your dosers? What are you dosing as i see 7 pumps? Im am considering this method and thought only 3-4 pumps was needed. If you need 7-8 pumps that can add another $200-600 to the project for a multipal dosing pump depending on brand.
I am currently using 6 channels, 1-3 for the elements (I combine 3A&B) 5-6 Vanadium, Manganese, and Iodine.
If you choose to add additional traces then they can be added by hand weekly if you don't wish to use an additional doser.