Unverified80% confidenceTradeoffTime unknown
双层结构垫（上层夹砂沟槽+下层集砂夹层）可从侧边开口倒出积砂，比单层水洗垫更省事，但夹层易残留潮湿砂结块，需定期完全拆洗晾干防霉
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80%
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Long-term
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