rectangular body 8 of the secondary support element enters the ceramic filter before the inclined end 9 of the body this ensures that damage to the inside walls of the ceramic filter is minimised once inside the ceramic filter the rectangular body extending axially outwards causes the inclined end of the rectangular body to press tightly against the inside wall of the ceramic filter which ensures that the ceramic filter is retained in the event it is fractured fig5 a and 5b shows a second design of a secondary support element 7 b which comprises a rectangular body 14 having an inclined tab 15 at one end of the body and a blade section 16 at the opposite end that is slightly inclined with respect to the plane of the body the secondary support element additionally comprises inclined flaps 17 18 extending along the longitudinal edge of the body the secondary support element is secured to the support 2 by positioning the secondary support element inside the barred enclosure and bending the inclined tab and inclined flaps around a hoop 3 and vertical bars 2 respectively this causes the blade section of the secondary support element to extend radially outwards from the barred enclosure any number of secondary support elements 7 a may be attached.