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It may seem counter intuitive to purify your drinking water with a stick of charcoal, but the Japanese have been doing it for centuries - and it makes your tap water taste great. No excuse for buying plastic bottled water if you don't like the taste of tap! New feature: the addition of a locking coil to the?filter allows you to use it in your on-the-go water bottle without it rattling around. The locking coil bends to fit your bottle ensuring the charcoal water filter is held in-place. The loop on the top of the coil helps you to remove the filter when the bottle needs washing. Note: water filter with the locking coil requires a minimum spout width of 30mm More on the Charcoal water filter: it adds minerals (such as calcium) and removes chemicals (such as chlorine). You can pop it into any water bottle, jug or other holder you have and it lasts for 6 months! Incredible stuff - read more about it below. When you have finished using your binchotan as a water filter, it still has many secondary uses. If you break it up and put it in your house plants, it will add nutrients to the soil that will help the plant to grow. Due to its porous surface, it can be used as a deodoriser to remove unwanted odors in your cat litter, laundry basket, nappy bin or shoes. Binchotan is also an effective moisture absorbent and can help absorb humidity in the air if placed in a wardrobe.? This is 1 vacuum wrapped binchotan active charcoal filter with a locking coil in a recycled card box. Features: 100% natural wood Makes tap water taste great Each filter lasts up to 6 months (with a recharge by?boiling after 3 months - see below) Stainless steel coil locks the charcoal into place and leaves no taste and won't rust your bottle Pre-washed and ready to use Fits in any water bottle or jug with a spout width greater than 30mm Help the planet by not buying?bottled water Save money by avoiding bottled water Size: (water filter) 11.8cm high, 2.5cm wide approx Do not ?wash with soap. What is the history of Binchotan charcoal? The origins are not completely clear but it is believed that a form of Binchotan charcoal (sometimes referred to as 'white charcoal') was introduced to Japan by a Japanese monk and scholar called