I'm interested in this as well. I was looking at the Pacific Sun Kore 5th, but it seems for the money there are better options out there. I've also toyed with the idea of running BRS pumps via Apex. I was running that set up on my old system and it worked well so long as adjustments were made based on test results. My only reservation on using the BRS pumps via Apex on my new build is that it seems to take up more space and I need another EB to allow for all my devices to run via Apex.
Other than Litermeter, is anyone using any other dosing pump system for AWC? I'll be working a with relatively small total water volume of approximately 100 gallons or less.