FILTRATION SYSTEM MEDIA

Information / product required
I manage a commercial water filtration design company, Jonkers Filtration Systems. We specialize in designing large water treatment systems for drinking water purposes.
I require a ?west coast beach? type pebble like the type found on Haast beach, to be used in the base of large water filters as a support media. I need a washed, very smooth pebble which will resist the growth of bacteria that tends to grow on the rougher types of aggregates.
Are any of your quarry members able to provide me with the contact details of a quarry/supplier that could possibly provide this type of product?
contact Kurt Jonkers