Tim/doc - I like the concept of this unit, but not sure how it would work with my system, and how you would conect it inline with a top-off system?

I have a HUGE evaporative topoff requirement (700g system) which I am topping off with 100% Kalk water currently and PH/dKH/Ca levels are barely being maintained.

I have a ReefFanatic top off controller that basicaly turns on a pump when the float switch triggers. If I understand this unit, it simply connects in-line with the RO/DI and water pressure causes it to mix & dose, and a simple Kent float switch in the sump would shut if off, right?

With my evaporative volume, I would be concerned that it would be active too long/often and would end up dosing a Kalk cloud.

Any thoughts on how I might be able to use one of these, or a bigger one?

What's the price target on these?

Thx - Steve