Well, I'm already tired of dosing 2-part by hand. What all dosing pumps do you guys use? The two I'm most seriously considering are the Neptune DOS and the GHL Doser 2 (4 channel. I like the DOS because it completely integrates with my Apex. One UI, one control panel, that I can access from anywhere. The major downside is the cost. 350 big ones for two channels. That's enough for 2-part, but I'd like to also at the very minimum dose carbon, and maybe acropower or some other nutrient. So for three channels, that DOS will cost me $700. The GHL Doser 2 has a 4 channel model for $459.90. The downside? It doesn't integrate with my Apex and I have to use a different UI to control it. They are both high quality units with stepper motors, so no issue of accuracy here. I guess I don't really know which would have the better build quality. Anyone have any thoughts? Are there any other units I should consider? Or should I say screw it and just get a couple cheapo BRS pumps?