aquasoil

Question: if AquaSoil and Flourite are mixed together and the AquaSoil has been in the aquarium for its 2-year shelf life, how would you change/remove the used up AquaSoil?? Does the Aquasoil crumble to dust and the Flourite stay solid and it can be vacuumed or washed or sifted out?

Why is this stuff so hard to find? Specifically Aquasoil Amazonia Only a couple retailers sell it online to the US, and retailers near me never heard of the stuff and can't/won't get it. We don't even get the advantage of having healthy competition between stores/products because there is...