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Well you asked if you "have to" use a doserI been dosing by hand for a year now. And sometimes I forget to do it because of work. I've been using the red sea to monitor my Ca, Mg and kH.
No you dont have to, but im sure it would make it easier for you.Jebao. Been using mine for 2 years ZERO issues and inexpensivewhat type of doser is this?

Nice looking tank. Love it.Five things.
1. -calibrate it as per instructions first
2. -test each channel to ensure if you request 10mls, it pushes 10mls.
3. -manually dose daily to bring up each element for a week and see what weekly dose would be, divide by 7 for daily.
4. -program that daily dosage into the doser.
5. -keep a watch on the levels through testing and adjust up or down as required.
It takes a bit of time to dial but well worth it.
Remember don’t dose CA and Alk at the same time, keep these two at least 30 minutes apart.
I dose my Alk hourly, during lights out when PH is low.
I dose my CA hourly throughout the lighted time.
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