In reply to the sand filter user I wanted to point out the use fo glass media, in our case recycled and sterilized and available at nominal cost. Information on advantages of using glass versus sand(aside from environmental considerations) are detailed at length at
www.glasspackfilter.com. The entire filter platform is used vs the top few inches of a sand filter. This is ideal for major contaminated water, particularly with oil and lubricants. Residentially it can be used in numerous applications.