The "spigot"/"tap" that drips the water from the calcium reactor into my sump could probably do with swapping out. Where can I get this piece...what's it called ? The reactor is the K2R
Adrian, you can use a variety of valves for this. Local hardware stores will have dripper ball valves in their plumbing and/or lawn section. Or you can go to this website and find the valve that best suits your need. I would imaging 1/8" is the diameter you'd want for the effluent of a pH reactor.
The easiest thing, of course, is to get a replacement from the manufacturer