Redundancy is something that I'm trying to build into the systemand was leaning toward external pumps. They seem to be a good solution if youhave the space.I like the idea of having a having a pump prerigged in the eventof an emergency that someone could swap it out. Spare fittings and extra pumpsare critical it seems. Plus someone you teach how to deal with the tank and themajor emergencies that could occur and have detailed instructions for them tofollow or video to refer to.
I had someone else tell me their CA reactor is finicky and theywere going to switch over to dosing. I like the failure response of the dosing pumps.Something that I will review!