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Old 02/09/2018, 05:11 PM   #33
bertoni
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Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 86,377
pH at 7.0 is hard to believe. Are you sure it's not higher? That should be a measurement error.

The alkalinity might be dropping due to the lanthanum chloride or increased growth. Some lanthanum will precipitate as lanthanum carbonate.

Kalk is a fine way to add calcium and alkalinity, but I'm not sure I'd have two experiments in progress at the same time. I'd probably just add a bit of baking soda to get the dKH up to at least 7 for the daily low. Maybe the tester is a bit off, but the number seems to be reasonable.


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