Thanks for interacting with me about this idea. I am remembering back from something I looked into earlier this past summer. So I will look closer at the package.
So when you were mentioning the use of zeolite to remove nitrates and nitrite from tanks, you were referring to water tanks for supplying water for drinking and cooking right? Not fish tanks?
As I looked at the video it refers to koi ponds. So if the pellets that I found are truly only zeolite, I may be able to use them in my HOB as I would use bio rings. And I could recharge them from time to time with salt. Is that how you are seeing it?