1.The Crystalbrite or Filtabrite pad is inserted inside the  filter body.
The Crystalbrite pads can be fitted either way but the Filtabrite pad MUST be fitted with the patterned side facing the support  disc.

2. The support disc is  placed on top of the pad with the side marked 'A' facing the filter pad and  with the three lugs located into the slots of the filter body

3. Next screw the locking ring  into the filter body to secure the pad being careful not to cross the thread. 
Tighten the locking ring with the spanner provided (see  photograph).

4. Attach the funnel to the  filter body.

5. It is first necessary to  rinse the pad with tap water which swells the pad material and also removes  any loose fibres.