Yep, but this is not about the $$, while still considerable less than a Pollen Glass 20 mm etc and more than likely more effective.

I think it will appeal to folks that do not enjoy stuff in their tanks, like in line devices, are more interested in the mist effects vs the 100% dissolution methods reactor tubes provide.

If you have used disc and blasted the mist around with current, you can see the long term and short term growth differences vs other parts of the tank, the goal with such mist devices is to how best distribute them.

Venturi's and spray bars appear to be one of the more effective methods.

Regards,
Tom Barr