This is a carefully graded round grain Quartz Silica. It is produced to meet AWWA and ANSI standards for water filtration and Human drinking water. The Filter Sand is certified to NSF-61 standards.
This is a carefully graded round grain Quartz Silica. It is produced to meet AWWA and ANSI standards for water filtration and Human drinking water. The Filter Sand is certified to NSF-61 standards.
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