Floating ad can clean between 2 and 8 thousand gallons of water per day.

Advertising is often associated with products we don't need, and messages that get drilled into our head whether we like or not, but there are a few that try and take a different approach. One of the latest examples is a floating billboard from the Japanese beauty brand Shokubutsu HANA. Installed on the extremely polluted Pasig River in the Philippines, the billboard is made from a type of grass that can absorb toxic materials and help to reduce pollution.

The billboard is made from Vetiver, a perennial, non-invasive grass often used to treat wastewater and stabilize landfills and garbage dumpsites, with the simple message, “CLEAN RIVER SOON.” According to Hana's website, the billboard is able to clean 2 to 8 thousand gallons of water per day, thanks to its ability to tolerate high levels of nitrates, phosphates and heavy metals.

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