The filter diatomaceous earth series SMD System: 3 ® is the latest technology in filters. It is a filter suitable for all types of pool, Spa-jacuzzi. It is made of top glass reinforced resin. It is efficient and provides crystal clear water in the swimming pool or in the Spa, you hold and what little dirt (to 1/10 the width of a human hair). This means that body oils, suntan cream, pollen, dust and even some bacteria are trapped in the filter, leaving behind clean and healthy water.