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Is This Grit Suitable?

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I've just picked up a bag of horticultural grit to use for a drainage layer in my terrarium - it says on the front washed and lime free, which looks perfect. To test it I've just sat some in some 0 TDS water and it's currently testing at about 10ppm. I'll leave it soaking for a few hours to see how it goes.

If it stays at around this sort of level is this OK to use long term in a terrarium? I'm assuming I'll need to replace the growing medium every year or two anyway, but obviously I want to reduce any build up of minerals as much as I can.


EDIT: Currently sitting at around 20-25ppm.

Edited by Netjer

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