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At the July 2021 meeting of the American Association of Plant Food Control Officials (AAPFCO; Arlington, Virginia), the organization recognized a new method to measure water-extractable phosphorus (WEP) for fertilizer products. The results from this method highlight the slower release of phosphate-phosphorus from biosolids-based (and other carbon-based) products. AAPFCO also determined that making labeling claims of slowly available phosphate for carbon-based products was allowable.

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To provide further clarification on the virus that causes COVID-19 infections and concerns about how it relates to residuals, sludge, and biosolids for water resource recovery facilities (WRRFs) as well as the wastewater sector at large, this article includes a review of available data related to the virus and surrogates as well as their potential associations with residuals, sludge, and biosolids.

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An update and expansion on “The Water Professional’s Guide to COVID-19.”

In an effort to keep the water community informed of coronavirus developments, this update highlights the latest scientific findings, as well as topics not previously addressed. The goal is to contextualize these new results and state the implications and significance from a water and wastewater collection and treatment, public health and water resource recovery facility worker perspective.

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