Repeat that
Ca test. Stop dosing everything if you are getting test readings like that.
If you are truly at
Ca of 600+, then I would recommend an immediate large volume water change because who knows what your
Alk is like.
Once you've got your
Ca and
Alk at proper levels with water changes(say...around 400 and 3.0mEq), then you are ready to start to PLAN your
Kalk addition.
Take your
Ca &
Alk readings at a specific time each day. Try to get the readings at exactly 24 hours apart. Write down the results. Repeat this for a week or until the
Ca/
Alk has fallen too low (say..down to 380/2.5mEq).
This should tell you how much
Ca/
Alk your system is using per day. Note that. ie. you learn
Ca drops by 20ppm over 5 days (4ppm/day).
Now take a measured amount of your pre-mixed
Kalk solution...say 500ml. Setup a drip overnight ensuring that all 500mls gets into the system...slowly.
Next day..take your
Ca/
Alk measurements again at the same time. Did the
Ca/
Alk readings increase? If so, you've added TOO MUCH
Kalk. Based on the knowledge of knowing how much it would have dropped had you done nothing, you should be able to figure out how much
Kalk to try on the next night.
ie. Imagine it rose up 10...had you done nothing it would have fallen 4. Therefore 500ml of
Kalk in your system moves the
Ca +15ppm. Next night try about 133ml. (500 x 4/15).
The only thing that you can accurately control is the AMOUNT of
Kalk that you add over a 24 hour period. The idea is to figure out exactly how much
Kalk you need to MATCH the
Ca/
Alk that your tank uses.
Finally..vinegar. Vinegar is only used when you run up against the limits of
Kalk. It enables you to dissolve MORE than 2 tbsps/gallon into the
Kalk. My guess is that you have a long way to go before you hit the limit. You'll know when you get to that point.