Slow and sure method is to take a sample and placed them in a pail and do a before and after 3 days test to check if it influence the PH.
Fast easy method especially if you intend to buy certain type of substrate in lfs and to be absolutely sure it doesnt bring up your PH is to do the vinegar test as in video.
Pour on to a dry sample, if it frizzled then it'll bring up the PH, if it doesnt as in the lava rock then you're good to go.
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