GRAYL ULTRAPRESS, with a 500ml capacity, easily purifies water. Purchased as a countermeasure against Echinococcus, I tested it once with tap water and then brought it to Hokkaido, but I never used it. ♦ I don't remember the exact purchase date, but I think it was 3 or 4 years ago. The cartridge has a 3-year expiration date after opening, so it's probably safer to replace it. The appearance is fine, but if you choose to use it without replacing the cartridge, please do so at your own risk. Replacement cartridges are available for purchase at Montbell. 【Product Description】 A water purification bottle that allows you to quickly secure safe water in the outdoors. It purifies water in just 10 seconds and removes 99.9% of viruses, bacteria, and parasites such as Echinococcus (※Removal rate based on manufacturer's data). A compact model with a small drinking spout. With a replaceable water purification cartridge, it can be used repeatedly, ensuring safe water for outdoor activities, overseas travel, and during disasters. 【Materials】 (Outer bottle, inner press, cap) Polypropylene, (Cartridge) ABS resin 【Size】 Diameter 7.5cm x Height 24.77cm 【Capacity】 500mL 【Heat Resistance】 Outer bottle, inner press, cartridge (resin parts): 100℃, cap 130℃ ※Do not use water above 50℃. This may damage the filter performance. 【Filtration Flow Rate】 500mL/10 seconds (3L/min) 【Cartridge Replacement目安】 300 times (150L) ※Replace the cartridge when the filtration time exceeds 25 seconds. There is also a Japanese explanation provided by the importer, Montbell, but detailed instructions are included in English as a quick start guide. This is a used item, so please refrain from purchasing if you are concerned about its condition. No claims or returns are accepted. Please contact me if you have any questions. Please specify your desired price when negotiating a discount. I will not respond to template comments like "Is a discount possible?". I plan to ship via Rakuraku or Yu-Yu Mercari delivery services.