Anker 18w Quick Charger
Anker, a popular manufacturer that makes some excellent 10ft micro-USB charging cords that have made my life much easier, also offer a quick charger you'll want to consider. This is actually what I used for years, before switching to USB Type-C.
The Anker 18w Quick Charge 2.0 certified charger will power up your device up to 75% faster than typical chargers, and has a high 2.0 amp output. These work wonderfully with the Galaxy S6, and will charge all your other micro-USB powered devices at regular speeds. It's completely safe. They even have a new one with two ports for charging multiple devices.