Thx Rovster!
Frank 2x MP40QD
I like the DOS, i use one for water change and another for 2 part. Easy to setup or tweak in the neptune fusion dash and the 2 part DOS is silent and spreads your dosed amount into small increments throughout the day. Only thing some may not like is that unless you edit the program some it doses alk/cal at same time, although i use it this way and its no problem at all (according to neptune the amounts are so small it doesnt cause any precipitation)