I have an Aqua Tech pool with the cartridge filter system, when draining water from the pump area, should I close any of the valves (ie going into the filter) or just leave everything open when opening the drain valve?

I have an Aqua Tech pool with the cartridge filter system, when draining water from the pump area, should I close any of the valves (ie going into the filter) or just leave everything open when opening the drain valve?