| 摘要 |
<p>A swimming pool treatment device comprises cylidrical pills comprising solid water treatment material such as trichloroisocyanuric acid. A collar is surrounds the periphery of the pill so that only the end surfaces thereof are engaged by the water. Consequently there is a constant erosion of the pill material. Various containers for one or more pills are disclosed. The containers which rest on the pool floor have downward projections that permit sufficient water flow below the pill container to prevent staining of the pool floor.</p> |
