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Page 18 has the method they use for pH buffering
Page 30-32 has the breakdown in the water
 

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Discussion Starter · #7 · (Edited)
acid will lower the kH in the water column. i.e. phosphoric acid (pH down), citric acid, white vinegar. Organic acids can cause cloudy water when the organic breakdown and start feeding beneficial bacteria

More natural method - catappa leaves (almond leaves), acorn caps, alder cones. peat.
Beech leaves should work. That is what people use in leaf litter for growing blackwater plants, not sure if the acid nature is species specific

The TDS in the water is quite low. around 25 to 29 ppm.

disclaimer: if people use nitrate as a plant fertilizer, the pH will climb overtime even after reducing the kH with acid. Fertilizers and Soil Acidity
 
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