Allow the unit to run until the waste water runs clear. If the filter is unusually dirty this procedure may have to be performed twice. Don't void your warranty. Follow these instructions whenever you change the bead biofilter's valve position. When using submersible pumps with your bead biofilter it is probably not necessary to turn off the power to the pump while turning the control lever on the 6-position valve on your ProBead.
Submersible pumps operate at lower water pressures.
We have experienced NO problems with submersible pumps. When using external pumps with your bead biofilter you MUST turn off the power to the pump before moving the lever on 6-way valve. Many external pumps operate on higher water pressures. By not turning off the power to the pump prior to moving the valve you could damage the ProBead or the pump and void your warranty on either or both products. Any of these types of damages are NOT covered by either product's warranty.