Turn HydroFlush™ Valve to the "Backwash" position.
When water exiting either filter's drain line runs clear - the filter is clean.
Turn the pump off, close the Hydro Vortex™ filter's drain line, turn the HydroFlush™ valve back to "Filter", or turn the HBV™ filter's multiport drain valve to rinse.
Turn the pump back on. The Hydro Vortex™ filter is finished.
For the HBV™ filter, when the water exiting the drain line runs clear in the "Rinse" position - turn the pump off, turn the Multiport valve to "Filter" - then turn the pump back on.