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NOTE: Filter cartridges need to be replaced every 1 to 12 months (average 6 months) and the membranes every 12 to 24 months, and all depend on the incoming water quality, water temperature and if the water is safe for drinking. These numbers, however, are usually just guidelines.Start drinking healthy and stop drinking impurities with your own home Reverse Osmosis Deionization Water Purification System. Vostok offers the highest impurity reduction rated systems for up to 99.99% reduction of major water impurities and improves the taste of drinking water and water for your aquarium and fish tanks.We have designed our filtration systems to work for long-lasting high-grade impurity filtration, giving you the cleanest water and the best value in filtration.Choose the best in home filtration and start drinking healthy today!