I built a DIY system that can be seen on the ORCA site...works really well....my Calcium never changes now, and the Alk just makes slow lazy swings, I will get it tweaked in eventually....And, BTW, I dose Oceans Blend two part with it....
I use a turkey injector from wally world that has a stainless needle and is marked in ML. I just broke the needle off at the frst whole so the needle only injects out straight lol. Works fine for me, and give me an accurate measurement. Just good old human labor, but it works just fine and makes no messes. I (the wife lol) got tiered of me spilling the stuff in the carpet lol. I use Randy's home made 2 part solution, and keep it in 1 gallon rubbermaid clear containers just like what you get the large blackdiamond carbon in. I use a seperate needle for each part and rinse with tank water after each use.
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