So yesterday I asked a question if I can put that random slab laying around out the back garden for 3 years. And it is concrete by the way.
So i left 24 hours submerge in a bucket of water with prime. And within 24 hours the ph went from 7.6ph to 8.5+ph
Hehehe, I think I won't be putting it in my tank.
Posted by Individual-Event78