Things You'll Need
Instructions
Drain the cistern completely and allow the bottom close to the drain to dry thoroughly.
Place the x-type vortex breaker directly over the drain. The vortex breaker is simply a tall metal ̶0;X̶1; design where the cross pieces in the middle sit directly over the center of the drain. As water is pumped out and a whirlpool tries to form, the metal legs of the device break up the vortex and allow for smooth pumping.
Secure the vortex breaker to the bottom of the cistern using the bolts and wrench. Depending on the material of the cistern bottom, use masonry or metal bolts. Ensure that the vortex breaker will not move laterally.