What is the minimum specification for a sand filter liner according to the system designer?

The minimum specification for a sand filter liner according to the system designer is that it must detail design and installation requirements. This specification is essential because proper design and installation of the liner are critical for the overall functionality and efficiency of the sand filter system. The design and installation requirements ensure that the liner effectively retains the sand and other filtration materials, prevents contamination, and maintains the integrity of the entire system over its operational lifespan.

Moreover, detailing these requirements provides guidance on the appropriate materials to use, installation techniques, and maintenance protocols, which are crucial for ensuring regulatory compliance and optimal performance. In contrast, the other choices do not encompass the comprehensive guidelines necessary for building an effective sand filter system. For instance, a non-reinforced liner may not provide the necessary structural support, whereas biodegradable materials could lead to premature failure. Similarly, limiting the liner to recycled materials only might not meet the performance standards necessary for a sand filter.