WesTech GAC contactors can be supplied in an open-top gravity system or, more commonly, in pressure vessels. They are typically designed with a conical underdrain for convenient GAC replacement.
By contrast, the HomePod is essentially an extension of the iPhone, like an accessory. When someone asks the HomePod to open a third-party app, the request wonât go directly to the cloud, as with the Echo, but to an iPhone. As a result, developers can't write apps for the HomePod. They must create tweaked versions of existing iPhone apps.
The HomePod can detect its surroundings, tuning its output to sound good no matter where it is. Schiller made a big deal out of the HomePod's sound quality, which makes sense given that Apple owns Beats, and it also gives Apple at least one good reason to buy its speaker and not Amazon's.