Start with some two part, I like BRS if you don't want to make your own. Very easy dosing system and pretty clear mixing instructions. The calculator on the website is also a nice help.
Start dosing two part??..even with Cal. being in range?
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Just use the alk part. Simple A&H baking soda will work fine, but I'd suggest you bake it @ 400 on a cookie sheet for an hour to make it into soda ash.