Self-Cleaning Pre-Filtration for Case RO

A Case Marine 600 cubic meter RO system aboard P&O Cruises’ Arcadia

Case Marine has introduced new self-cleaning pre-filtration technology for its reverse osmosis (RO) system, according to John Case, CEO.

Replacing traditional sand filters, the Boll filter has a smaller footprint, more precise filtration grade, low maintenance, a longer service life and easy waste management, Case said.

“The filters are rated at 30 micron (0.03 mm), which means that they are designed to prevent anything larger than 30 micron to pass through. A human hair, for instance, is around 50 micron,” Case explained.

Case said that his company’s RO system uses centrifugal high-pressure pumps and centrifugal energy recovery devices, claiming that they take the pulsation out of the feed stream for the membranes, thus giving them a longer service life.

The system self-regulates for seawater temperature changes and when ships go from salt water to brackish or fresh water, he said.

Case noted his system is able to produce at rated capacity down to 10 degrees Celsius, allowing customers to use the equipment around the world without requiring pre-heating in most cases.

In terms of size, Case Marine’s plants are typically built for 1,200 to 1,500 cubic meters of water a day (310,000 to 400,000 gallons), although they can build as big as up to 8,000 cubic meters a day.

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