Hi

I cant seen to figure out the difference between the GHL Doser 2.1 and GHL doser Maxi? apart form one comes with 2 dosers pumps and the other configurable with 4.

I want to dose about 40-80mL of vinegar in a whole day and possibly other substances to control alkalinity/magnesium/calcium. But right now I will be starting with vinegar dosing only, so was wondering which doser would be advisable to purchase. The doser 2.1 seems to be better suited to my needs as i can configure 4 pumps apart from that I don't know much else.

Also am I correct to assume that I can add more pumps to doser 2.1 if I buy one with only 2 pumps to begin with?

could someone provide some help please, i would really appreciate it.

Thank you