ULNS systems typically do best with a lower dkh, around 7. However, mine has been above 10 for months running zeo with no ill effects. Not a really important value, other than stability. If yours is 11 and stays there, you shouldn't have a problem. A noted issue with high alk and ULNS is tips burning, but that doesn't sound like the issue you're having.
08-16-2011, 09:59 PM
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