Liquid purification or separation – Processes – Chemical treatment
Reexamination Certificate
1999-10-28
2001-07-03
Savage, Matthew O. (Department: 1723)
Liquid purification or separation
Processes
Chemical treatment
C210S765000, C210S805000
Reexamination Certificate
active
06254788
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a device and method for filtering and chemical treatment of fluid within a cartridge-type filter.
BACKGROUND OF THE INVENTION
Cartridge-type filters for swimming pools, hot tubs, spas and the like are well known in the art. Chemical treatment of pool water with sanitizing media such as bactericides, germicides or algaecides is also known in the art. Combinations of cartridge-type filters and chemical treatment are limited in the art.
U.S. Pat. No. 4,780,197 combines a cartridge filter with a chlorination module, but only a partial flow is directly in contact with the chemical treatment media. Even the insertion of a “tea bag” type apparatus filled with sanitizing media, as disclosed in U.S. Pat. No. 4,416,854, into the interior of a cartridge-type filter would not insure contact of the full flow through the filter with the sanitizing media. A need exists for a combination of a cartridge-type filter and sanitizing treatment, whereby the full system flow through the filter is directly in contact with the sanitizing media.
SUMMARY OF THE INVENTION
A cartridge-type filter is combined with a sanitizer cartridge (i.e., a canister) in a filter/sanitizer to both filter and chemically treat the full flow of water through the apparatus. The sanitizer cartridge may be adapted to a wide range of conventional cartridge-type filters and a wide range of sanitizing media, such as bactericides, germicides and algaecides, as well as an equally wide range of water treatment media.
A sanitizer cartridge includes an outer perforated tube and an inner perforated tube suspended between an end cap and an outlet fitting. The annular space between the inner and outer perforated tubes is filled with sanitizing media. The sanitizer cartridge is positioned within the hollow center of a conventional filter cartridge in a cartridge-type filter such that the outlet fitting is removably and sealingly connected to the filter outlet.
Substantially the full flow through the filter cartridge flows directly through the sanitizing media in the sanitizer cartridge. Therefore, virtually all the water is both filtered and sanitized by the filter/sanitizer.
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“The Natural Spa Purifier” advertisement, for Fountainhead Technologies'Nature2device, undated.
H-Tech, Inc.
Savage Matthew O.
Selitto Behr & Kim
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