Question for the coast

[Chin_Lee]

I would think with the temperature change and increasing the salinity of Pacific NorthWest NSW to reef suitable would probably eliminate all the microfauna /natural pathogens out of the PNWSW but thats my uneducated guess. I've read that people let the water sit for a few days or a week before using it. Vancouver aquarium uses nsw from the coast but it is apparently filtered through huge sand filters.