That's good to know. It just doesn't make sense. If it leaches out ammonia and other bad things just soak and wash several times before use, why do a 100 percent water change? It is a waste of time an money. Just trying to understand the logic behind this.I've never done the recommended water changes during the 'cycle' process. I only swap water when ammonia concentrations exceed 5-6PPM. And even then, it's usually only a partial change.
its tougher than most think.There's no reason to rinse/wash it, as that will cause unnecessary breakdown. Try to be as gentle with Aquasoil as possible.
In some cases, you have to do large water changes because the ammonia levels are too high. Really depends upon the amount of substrate used in a tank and several other factors.