you can use the marine magic dosing pump like I do. they will only run you 149 plus shipping for a 3 pump unit. I only use a dual pump as mag. don't need to be dosed as often.
I only have a certain budget. I can't make up my mind if I should get a Neptune Apex or a GHL Profilux SA doser. I was asking this question earlier, but, if I buy the Apex, I can't afford any dosers to go with it.
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