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Discussion Starter · #1 ·
Does anyone have any experience at usinf chert rock as a substrate,
Does it leach toxins?
Does it affect pH
.....
Any info is appreciated.
Oh, I tried googling, and it only had info on geologic timescale leaching/ dissolving.
 

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I haven't tried chert, unless some of the rocks I have used were chert. It doesn't seem to contain anything that would leach out in water. You could always put a small amount in a bucket, add water, measure the KH/GH/pH of the water, let it sit for several days, then re-measure the KH/GH/pH and see if they change.
 
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