| abstract |
Tablet and granules for treatment of pool water comprise at least one water-soluble sanitizer and at least one lanthanide compound (other than phosphate) compacted or otherwise formed into a physically coherent body. A matrix, carrier or binder adapted to dissolve and/or disintegrate over time in pool water may also be used. The sanitizer and lanthanide are dispersed within the tablet or granule so that, upon dissolution or disintegration of the tablet or granule, the lanthanide compound will be released. A method involves placing the tablet or granules in the flow of water to the pool filter so that, as the tablet or granule dissolves, the sanitizer is dissolved into the pool water and the lanthanide is carried into the filter where it is retained as a particulate solid that is effective in removing phosphate from pool water circulating in the filter and from whence it can be removed by backwashing. |