Neptune DOS and Red Sea ReefDose. DOS was my very first doser and I love it, because it does its job, but I preferred and loved
It’s very sleek and compact and of course you get more heads for almost same price as DOS.
Very accurate than the DOS.
Way easier to program.
It gives you notifications when container is almost empty.
The best part of it is ReefDose will tell you when it misses a dose also then it will try to dose on a different times.
I’m sure DOS can do that too, but programming is pain in a butt unlike ReefDose is just one click and done lol.