Takara Belmont RS III Operating Manual page 18

<The case of Spa-showerhead>
Rotate and detach the sprinkling filter unit and remove the
three parts (sprinkling filter unit, air bubble unit, and rubber
gasket).
Do not detach the O-ring.)
Clean the sprinkling filter unit (with water).
Remove dirt, such as water deposits in the shower holes
on the sprinkling filter unit, with a toothbrush.
Clean the air bubble unit (with water).
Clean the unit once a month (as a general guide).
Remove dirt, such as water deposits on the air bubble
unit, with a toothbrush.
The air bubble unit should be rinsed with running water
in the direction shown in the illustration below:
Running Water
Re-assemble the showerhead.
<Assembling Procedures>
(1) Insert the air bubble unit and the rubber gasket in
the sprinkling filter unit in this order.
(2) Mount the sprinkling filter unit on the showerhead
main unit, while the water discharge side of the
sprinkling filter unit facing down.
<The case of Yume-showerhead>
Clean the shower filter unit (with water).
Remove dirt, such as water deposits in the shower holes
on the shower filter unit, with a toothbrush.
[ Spa-showerhead is an optional part]
Air Bubble Unit
[ Yume-showerhead is an optional part]
O-ring
Rubber Gasket
Air Bubble Unit
Sprinkling Filter unit
Surface to be Cleaned
(front and back)
Shower Filter unit
Surface to be Cleaned
Showerhead Main Unit
Water Discharge Side
Body