Yes, that is a concern Rob. I was going to do that in the resevior at first but I think dripping into my overflow would be less dangerous. I had planned, if I went with kalk to double up on the drip controlers for redundancy. Actually that would work with 2part also, just 2 jugs.

I still have to calculate all that stuff. Another thought probably nixed now was adding one of the parts to the res. but probably not.

I think 2 part sounds the best to me. I have to feed the fish daily so it isnt much more work to add it 1/2 in the morning and 1/2 at night. more control and I can set it up to drip at later time if I want too.