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Why is there no quartz sleeve on the Gravity UV+Bio Filters?

April 26, 2017filters gravity Quartz sleeve uv+bio

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Why is there no quartz sleeve on the Gravity UV+Bio Filters?

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Fish Mate UV+Bio gravity filters have their bulb positioned above the water which is why they do not need a quartz sleeve. This quartzless system has several benefits; it cannot be damaged by frost and will not be affected by limescale associated with hard water areas.