Patent ID: 7067056

Claim:
A combination for use in a pool or spa, comprising: a) filter structure in the path of pool or spa water flow, said structure having pleats b) substance in direct contact with or integral with a surface or surfaces of said filter structure, to contact said flow, c) said substance characterized as being one of the following: i) bacteria inhibiting ii) an algaecide iii) an algaestat iv) a sanitizer v) a bacteriostat d) said substance having the form of a coating on said filter structure surface or surfaces, e) said filter structure including x 1 )a perforate tube in the filter structure interior to receive and pass filtered water, x 2 ) a pleated filter element extending about said tube, said substance coated on both said tube and filter element, f) said filter structure having a cover plate in flow passing registration with said perforate tube, said substance coated on said cover plate, in endwise facing alignment with filter element pleats also extending endwise; whereby said substance is also outside the filter but contacts some of said flow.