I picked up the ACTIVE CHARCOAL WATER FILTER x 4 to cut back on bottled water, and it does the job. Following the traditional Japanese Binchotan method, each stick removes chlorine and adds minerals, so my tap water tastes noticeably cleaner. The set gives two years of filtering since each one lasts six months, and I like that it's sustainably sourced from protected woodlands. It won't fix heavily contaminated water, but for everyday hydration it's a simple, low-waste swap that saves money too.