I use this product and am pretty happy with it.
You are supposed to use it in equal parts, so if your calcium is down just add some turbo calcium(or similar product) until your calcium is good.
I have about 100 gallons of total water and I use 50ml of each A and B daily and it keeps my Ca at 400 and my dkh at 8.0. It is also very good at keeping my ph at a stable 8.2-8.3.
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