Profile: CPR Aquatic, Inc. manufactures a wide variety of equipment for the the marine aquarist. Our cyclone BAK-PAK™ 2R+ skimmer is designed for use on reef tanks where biological filtration is not necessary. Our continuous siphon overflows/prefilters are the best means for getting water from an aquarium to a filter system without expensive modifications to the tank. The advantages of these prefilters include adjustable water level allows operator to easily change the level in tank, black top reduces algae growth, plastic screen to prevent fish loss and quiet operation.