| 摘要 |
2079874 9115195 PCTABS00007 A toroidal chemical tablet (12) with a close fitting water impervious peripheral barrier (14) surrounding its sides with exposed upper and lower annular surfaces is disclosed. The tablet (12) has a central hole (16) to aid in water flow and dissolves inside out for even feeding. Also disclosed is a pool chemical tablet (12) partially encased in a covering (14) which when placed in a pool skimmer gives a visual indication when the tablet (12) is substantially dissolved, as well as methods for using the tablet (12).
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