Ablution is an essential practice as a Muslim because it is an abligatory required
to perform prayer. A Muslim use approximately 5 litres of water per single
ablution. Approximately, a Muslim use 25 litres of treated water to perform
ablution. Islam categorized the used water produced from an ablution as
Musta’mal water. Normally Musta'mal water will be left to flow into the drainage
system. The accumulated amount of wasted water is significant when it is
measured at a mosque or surau. The quality of Musta'mal water is far better than the typical quality of the waste water produced from washing activities because there were no oil, grease, soap and dirt except for small quantities of
miccroorganisms. To overcome this problem, this study focused on the
discussion of reusing ablution water based on Shari'ah law which led to the
development of a system (or model) to reuse ablution water. This ablution water reuse system consists of several parts including ablution water collection tanks, filters, storage tanks, filling tank, water pump and water sensor. This system runs automatically using a water pump and water sensor. The study found that the Shari'ah law allow reuse water to be used again as ablution water. Based on this study, it is found that the ablution water reused system is feasible and is able to be produced from the engineering aspect.