Mark what were you using for the single doser? A BRS single 1.1ml/min doser costs ~$85 and an appliance timer is $8-$18 (for a digital one that will run in minutes instead of quarter hours or hours).
That single doser setup costs as much or more than the DP-4. Even if you only use one channel of it that gives you everything built into a single programmable unit instead of trying to find a spot to plug in another appliance timer to your power strip.
It's really hard to beat the price of the DP-4 for dosing setup.
My ocean. 90g (yup, won it!), 40g, 28g, & 10g Systems PADI Advanced Open Water Tank Thread:
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