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Some UPS don't make a true sine wave which is hard on pumps. They usually only run a couple hours irregardless of the load. Penn Plax makes a battery operated air pump that only turns on when power is lost. A friend on mine looked at several diffeent brands and the Penn Plax was the only one that ran on "D" cell battteries that consistantly turned on and also lasted the longest when power was turned off.
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"Our crystal clear aquaria come nowhere close to the nutrient loads that swirl around natural reefs" Charles Delbeek
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