Does a shower head need to
have maintenance?

Yes, it does.

The pipe slowly gets rusty, and calcium and magnesium in water adhere inside the shower head. You need to clean a shower head by opening the cap for preventing the head from getting clogged, and keeping water clean.

Why does not Dynastream
need maintenance?

A metal ball rotates around inside Dynastream, which prevents impurities in water from adhering to the head.

Dynastream is cleaned up
every time you take a shower.

The water going out of the clean shower head is wonderful!