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Hey mike, if you have had 400 readings in the past and didnt change the chemistry much I would suspect those numbers, Kalk usuall y is OK at maintaining level but not at raising it(except pH)Then again it looks like you have a low bio load in the tank that could explain it, try topping of with straight RO for afew days and see what happens
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When considering courage in battle, one should remember that there are 2 sides to every conflict.
The heroism of the losing side rarely gets remembered
but we were all husbands and fathers, sons and bros
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