"I also have a 50cm sphere brought from another company. The wiring on the 50cm lays better as it has a cut in the side so the lid fits on top without having to manevour around wires coming out the top. It also has a seal that goes over the water filling point to stop debris going into the drum & is so much easier to fill up.
I also got free spray & cloths with the 50 cm sphere to keep it maintained."
Reviewed Saturday, 3 March 2012