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My town which borders Chicago has a water quality report that really only reports on harmful substances like lead, nitrates, etc.I'm sure you've pulled your municipalities water report to see what's in the tap. Most people consider it as stable month-to-month. I think JBL, Salifert and Hanna provide test kits to get you some idea of the Ca and Mg in your water. I used to use the Hanna Alkalinity Colorimeter to get an understanding.
Since Chicago supplies our water, I took a look there and it looks like for Calcium there's 34 mg/l and for magnesium it's about 12 mg/l. Total alkalinity (CaCO3) is about 110 mg/l. These are the averages because it looks like they took samples from either different locations, or just different dates.
Having never used Ca and Mg for top of water, what should the ideal numbers be? My only basis for these parameters has been reef keeping, but only from the extent that I'd use a high quality salt mix, my calcium reactor would take care of Ca, and I'd dose mg as needed, along with kalk to stabilize PH since the calcium reactor would effect it.
I'll need to check those kits out, but the Salifert Ca and Mg didn't have freshwater kits when I checked recently.
I still have my hanna checkers, but they're marine versions.
Also I forgot to add this to my previous post, but the needle on my CO2 regulator finally moved. I'd suspect that within the next couple days I'll need to swap out the tank. So out of this 10lbs tank I was able to get 6 months worth of CO2 injection.



