I wish there were a doser for dummies but all of them require calibration, programming and occasional monitoring. I use and have found the Jebao dosers to be a good option. Once you get their "system" down they're easy to calibrate, program and adjust. Plus, there are tons of Youtube videos on them. Side note - the directions that came with the doser I currently use on my frag system were wrong. I turned to Youtube, figured out what the difference was and it worked perfectly. Now that I think about it, I'm shaking my head in disbelief because the instructions were so clear on a specific point but were also 100% wrong.