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The test substance is a homologue mixture consisting of bis(2-propylheptyl) phthalate (DPHP) as main component (ca. 86%) and some of its isomers. In such a case, the criteria of the OECD Test Guideline (10 -day window) should not be applied. However, DPHP is considered to be readily biodegradable, due to its high degradation rate within 28 days (assay 1 = 98% degradation at test end, assay 2 = 82% degradation) and achieving the pass level within a 10-day window.