Malaysian Halal Certification Procedure Manual (Domestic) 2020 has issued nine Malaysian halal certification schemes, up from seven previously. Every Malaysian halal certification application for large and medium-sized industries must meet the halal guarantee system (HAS) by creating a standard operating procedure (SOP) in writing related to and as a preparation in case of non-compliance that is necessary to the process, and this matter has been enshrined in the Malaysian Halal Management System (2020). The expansion of this scheme has made it difficult for islamic cleansing (sertu) services and industrial companies to practice the islamic cleansing (sertu) process. As a result, the objective of this study is to identify islamic cleansing (sertu) from the standpoint of jurisprudence according to the views of imams from the four schools of thought, examine the meaning and method of islamic cleansing (sertu) according to halal legislation in Malaysia, study the practise of islamic cleansing (sertu) in the industry carried out by Global Dibagh Sdn Bhd, and analyse the issues that arise as a result of it. The study's findings are formed into recommendations for improving Malaysian practises and industries. This study employs qualitative methodology such as document analysis, interviews, and observations. According to the study's findings, Malaysia needs to improve existing sertu guidelines to meet the requirements of Malaysia's nine halal certification schemes. This study also identified nine issues that need to be addressed in the book Sertu Guidelines According to Islamic Perspectives (2011) first, the conditions that are required to islamic cleansing (sertu). Second, the materials for islamic cleansing (sertu). Third, methods of islamic cleansing (sertu). Fourth, the islamic cleansing (sertu) method for the sensitive machine. Fifth, management of waste materials affected by mughallazah feces. Sixth, qualifications for performing the islamic cleansing (sertu) process. Seventh, the number of workers and the duration of islamic cleansing (sertu). Eighth, the state of the remaining washing water islamic cleansing (sertu) flowing to other locations. Finally, the cooperation of appropriate authorities. According to the findings of this study, competent authorities should develop clear and detailed islamic cleansing (sertu) guidelines that are easy to understand and apply in the nine halal certification schemes, which include industry players, islamic cleansing (sertu) service companies, and the public.

Water saving is significant in Islam. Reusing wastewater through the water treatment process focused on membrane water treatment technology is one of the ways to save water. However, discussions and debates among scholars and the community continue to occur because the source of this water treatment is obtained from mustacmal water (pure water but not purifying) and mutanajjis water (impure water that does not purify). In addition, the material for manufacturing membrane water filters is also a dispute in terms of halal or otherwise. Therefore, this study aims to identify the concept of water treatment and purification according to the perspective of Fiqh and science. Next, this study also studies the methods of membrane water treatment and purification and then evaluates the process of membrane water treatment from Fiqh perspective. This study uses qualitative research methods through document analysis and interviews with six experts in the field of Fiqh and water technology. This study found that there are special methods in the treatment of mustacmal and mutanajjis water. Combined, it will result in a water treatment method that aligns with shariah.