Samsung S5 G900F this is smartphone which I truly love and respect because this was made to survive also at outdoor use.
I did put together few tips for you whom care to keep this phone alive and kicking for several years ahead.
Samsung S5 User manual does not say much about tips that any user he is obligated to do as maintenance in favor to proper waterproofing.
1) It does not say … DO NOT remove the back cover with out a good reason. (plastic hooks over the cover goes bad after 50 removals)
2) It does not say … Add baseline over the back cover O-ring every six months.
3) It does not say … Use microfiber cloth to clean from dust and dirt entire surface at the back of the phone before you attach the back cover.
4) It does not say… Get a wireless S-view cover so to remove stress from the charging port.
5) It does not say … Keep your own charging cable in to a dust free environment and away from your food.
S5 charging port this is protected from dust and pollution by it own protection cover, but power cables plugs get dirty if you are not careful enough, due such a cable you do transfer dirt at the charging port.
S5 G900 this is safe from water if you do all above, and never replace it screen at unauthorized service center (Original screen shields intact).
Practically, if you do all above and add also one Nillkin H+ tempered class over the screen, the phone becomes strong as fortress and water proof as submarine.
Original S5 back cover it is a poor choice but Samsung did it to keep this phone slim.
Original S-View cover this deliver lots of protection but the wireless charging version it is by far most wise selection.
With all above in mind phone electronics will stay healthy for decades, except if you are using S5 for navigation and this is exposed to enormously high temperatures under the sun in your car.
Historical facts: Samsung Galaxy S5 G900 this is considered today by Samsung as EOL (end of life) product.
Security updates for Android 6.0.1 these now are available only once per year.
Latest version of Samsung firmware for Europe , now aloud you to disable several build in apps.
Most Google related apps can be now disabled.
Several Samsung apps can be now disabled too.
In simple English, finally after several years you may have full control over your phone by this running stock operating system.