求翻译：Where water is not from a public supply of potable water, it shall be tested in accordance with the test requirement listed in Clause D3.1 of Appendix D to prove suitability for initial acceptance and at a frequency of two months thereafter. For those projects allowing the use of recycled water, the relevant specifications requirement shall be observed and the samples shall be collected and tested as per purchaser requirements.是什么意思？

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