Algae Master Pond UV instillation - If you have a severe algae problem you should effect a partial water change before starting the instillation.  Yamitsu Algae Master Pond UV can be added to any existing filtration system.  For best results algae master units should be fitted in line, after the pump, with water being forced through them.  Use the largest size of pipe possible.  If hose tails are to be used.  It is very important that they are trimmed to the largest possible size that will fit inside the flexible pipe (before glueing in place).  This will ensure that the maximum flow rate can be obtained for the size of the pipe.