[globaldesigns]

I personally do everything manually. I use to premix all my calcium, DKH, MG, Str and so forth, but stopped even doing that about 4 months or so ago.

Now I have a chamber in my sump, located near the starting phase of the sump. this chamber sits in the water about 3/4 in, and the bottom is slatted. In the bottom of this container, I put about 1/2 inch of course foam (like what is used in reactors) to cover the slats and provide a simple barrier.

On a daily basis, I measure out my recipe of dry goods (All now Seachem) and then dump the goods in the chamber. What happens is that the water flow around the chamber (especially underneath) draw out the dosing's, and as it leaches out, fresh water also goes in to replace the saturated water and the process keeps happening. Eventually the dry goods are gone.

What is nice about this, is that I don't have to fuss with premixing, and I find my parameters to be perfect with very minimal swings.

Just another way of doing things, I find this solution to work well for me.