[rvitko]

Alma,

Both magnet halves are waterproof, if a dry pain of glass is wet, the hold is lost as part of the hold is by the grip of the rubber surface, this only applies on wet glass that is otherwise dry, a similar grip is created when submerged.

dpstrand, with the flow deflector it is 9" tall, without it is 7.2". My personal preference is to omit the flow deflector, the pump has a very wide flow that literally fills the tank and I would place it about 6" above the sand in a horizontal position behind rock work where it can still be accessed for cleaning and I think you will see it creates a complete wrap around flow if your rock is open on the ends. It does draw in water from the bottom and it also back flushes once a day so the sand size has a big impact on distance from the sand but in my experience 6" is enough with typical 3mm grain size aragonite sand.