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The Crystal 3 has a flat cartridge filter that plugs in (usually pale blue) at the pump inlet.  This model was discontinued and Truma reverted back to the Crystal 2 as some of the Mk 3 filters leaked at the connections and from the seams.  The Mk3 filter is very difficult to find now and fetches £20 + on e-Bay.  The best solution is to replace with the Mk 2 (either Carver or Truma as both the same).  These are a straight swap in terms of aperture size and screw hole dimensions but will require a different pump connection and push fit elbow inside.  Make sure all old mastic is removed from the 'van wall before fitting the new one.

I believe Gary at arcsystems.biz had complete conversion kits.

Hope this helps.

Mike