Apologies for my ignorance in advance. I just "inherited" a used Dimension One Aurora II Ultralife. This is the first Spa / Pool I've ever owned (unless you count those plastic kiddie pools!) and have been reading up here about cleaning, decontaminating, etc. What a (sometimes overwhelming) wealth of info! Before you even ask, yes I have a k-2006 kit in hand It sat unused for who knows how many years, and it must have been left full when last used - there was a foot or two of water left in it that was quite... gross to say the least.
In my effort to clean this bugger out I've come across an issue. In the cavity where the filters go there appears to be some tan / beige substance. At first before my cleaning efforts it started at the top of the cavity and went down 4" give or take. Now its only at the top inch. It is very hard/brittle. With some effort I can chip the loose parts out with a finger nail. When you bend the flake it snaps. I don't think its algae or mold, it doesn't pull apart or get mushy. What on earth is it? After all the years it sat unused could it be some sort of algae that hardened? My guess is some kind of pipe sealant when it was assembled. I figured if it was a contaminate it would extend the whole length of the cavity.
Thoughts? Thanks for any input.