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I don't think @ycnibrc utilizes the entire Zeovit method, which is why he left some of the items out of his post.I've been doing Zeovit for a couple of months... it's not the cheapest method, but it's not stupid expensive, either.
Your calculation on blue bottles is pretty good, but it leaves out a couple of things...
Rocks. My system uses 1.5l zeolite every 6 weeks. 15.99 (price per liter) * 1.5 (liters used) * 8.3 (6wk periods in a year) / 12 (months) = $16.58 per month in rocks.
Oh... and GAC. I use half a pound of large particle lignite in a bag, change it out monthly. 0.5x12=6lb/year, $30 for 3lb=$60/year, / 12m $5/month.
So, your $9 a month for blue bottles, plus $16 for rocks and $5 for Carbon, $30 a month. A bargain, really, if it gives you the kind of tank you're looking for.
KZ recommends 10% weekly water changes... so there's some cost there, but you're going to be doing water changes anyway, with most reef methods.
That doesn't include 2pt, Calc RX, Kalkwasser, or whatever you're running for Calc/Alk maintenance.
Compare it to Red Sea's recipe, NoPo4x, Reef Foundation, Red Sea's colors, etc...
Or to Triton... $50 test kits quarterly, Core7, plus all of their little bottles...
I'd say Zeovit is somewhere in the middle of the pack.