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Thanks Randy for your advice on this. It does not seem there is much information on mixing Calcium Hydroxide into Vinegar so I am trying to get the mix right.
As my pH drops like a stone at night (3 people and 2 dogs breathing out C02 at night!), I thought I might try a couple of things first before I turn off the Kalkwasser dosing although, I think you have possible found the issue.
For 2 days I reduced the vinegar kalk mix by 1/4 and my alk never came down. I am now going to do the following to prove what is raising my alk.
1. Change the magnetic stirrer on the Kalkwasser container to mix first thing in the morning right after the last dose and only for 15 minutes reduced from 30mins. Test alk daily to see if I see a slight drop.
2. If no noticeable change from point 1, turn off magnetic stirrer on the kalk container completely so there is no mixing of Kalkwasser.
3. If both 2 and 3 have not dropped my alk, stop dosing Kalkwasser for a night or 2.
I am now thinking either 1 or 2 might do the trick. If that is not the case and it is 3, then whatever "pure" Calcium Hydroxide I was using before is clearly not as pure as Seachem Kalkwasser.
I assume you would not expect much alk in the vinegar mix as opposed to the alk from Kalkwasser?
The potency of the settled vinegar kalk mix can be calculated exactly. It is about 21 times as potent as kalkwasser. So 10 mL has alk potency similar to 210 mL of kalkwasser.