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Since that soil is 100% organic matter, I suggest that you soak and drain it several times. Then mix it half and half with a high CEC inorganic substrate. I don't know what is available in your location, but here we often use some type of fired clay product.

The soak and drain procedure will rinse most of the tannins out of the peat and pine bark that would otherwise cause tea-colored water. Tannins are not harmful per se, but may be aesthetically undesirable. Peat and pine bark are not high in nutrients, so that should not be a problem.
 

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Any of the forest soils will be fine. They will not need any pretreatment except for removal of any large pieces of organic matter to prevent floating. Use one of those and set your mind at ease.
 
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