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if youare one who thinks that having a sandbed is going to add any real denitrification value and that is why you plan on employing one then using find sand and at least 4-5 inches is what you want.

I am not one who thinks that they denitrify squat. Dont get me wrong, I am certainly not arguing the science of whether they CAN dentrify or not, I just think it takes way more surface area, and way more sand than the vast majority of people use to make it so. so the sand bed is nothing more than a big refuse pit that needs maintained, as well as will contantly absorb things until full, and release things as it wishes all along the way

That being said, use what looks good to you and coarse enough that it wont blow around too easily,maintain as well as replace it appropriately if needed and you will be fine.
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