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Kalk is probably going to be the cheapest you can just put it in your ATO reservoir. It's nice because it does alk and calcium and bumps up your ph which will help your coral grow faster. I run a calcium reactor and still dose kalk everyday to keep my ph up.
I used a DOS for dosing for years before I switch to a calcium reactor. It worked very well and was accurate. When I started using it for automatic water changes is when they started to break. I used to dose esv bionic
18x18x8 acrylic frag tank $75 or trade for 20 gallon cube or something similar. In good shape just need to be cleaned. PayPal or cash located in Hamilton nj 08620.
I keep my alk between 7.5 and 8 I get good growth with my sps and lps. I do dose kalkwasser to keep my ph up if you can keep your ph up around 8.1 to 8.2 you'll see faster growth.