Here are some resources to learn more about Caroma dual flush toilets as well as installation and maintenance how-to's.
Caroma ADA button option (video)
Caroma dual flush maintenance (video)
Installing a Walvit toilet (video)
Installing a Caroma 305 bowl (video)
Installing a Profile Smart dual flush toilet (video + pdf)
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The Profile Smart with integrated rinse station is one of the more promising green products in the marketplace.