| 摘要 |
An improved flexible, removable cover for swimming or other pools, which reduces contamination of water in the pool and is easy to maintain, has one or more discharge openings 13 covered by a further sheet 14 secured to the cover round its periphery and provided with an opening 18 through which a filter pad 19 can be introduced into the envelope or pocket formed between the further sheet and the cover proper. The cover and further sheet may be of thermoplastic material and secured to one another by welding.
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