{"product_id":"gravity-feed-water-system","title":"Gravity-Feed Water System","description":"\u003ch3\u003eA bag of contaminated water hangs above a filter. Clean water drips into your container while you sleep.\u003c\/h3\u003e\n\n\u003ch3\u003eWhen it matters\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eShelter-in-place at basecamp with questionable water source: manual boiling taxes fuel supplies and time. Gravity system processes overnight—1–3 liters per 12 hours depending on sediment.\u003c\/li\u003e\n\u003cli\u003eGroup evacuation to rural area: 4–5 people, limited boiling fuel, large volume needed. Gravity system handles continuous processing with zero fuel cost.\u003c\/li\u003e\n\u003cli\u003ePost-disaster relief station: spring nearby but murky, hundreds of gallons needed. Multiple gravity systems running in parallel do bulk processing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat it does\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBatch water purification when fuel for boiling is limited or zero\u003c\/li\u003e\n\u003cli\u003eOvernight processing—fill in evening, drink clean water at dawn\u003c\/li\u003e\n\u003cli\u003eMulti-liter capacity for groups (not single-person EDC)\u003c\/li\u003e\n\u003cli\u003eNon-obvious: pre-filtering sediment before relying on backup AquaStraw (extends straw life)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eBuilt to last\u003c\/h3\u003e\n\u003cp\u003eRequires hanging setup and time. Doesn't remove all viruses (depends on filter grade). Slow—1–3 liters per 12 hours. Not portable for transit.\u003c\/p\u003e\n\n\u003ch3\u003eWhere it fits your kit\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHome 72-Hour layer.\u003c\/strong\u003e Collapsible Water Bladder 10L: Bladder is top chamber (fill point); system hangs and gravity-feeds through filter into container. AquaStraw Field Filter: Straw for emergency direct-draw if system isn't deployed yet; or for redundant filtration.\u003c\/p\u003e\n\n\u003ch3\u003eSpecs\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterials:\u003c\/strong\u003e Polyester fabric with gravity filter cartridge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlow rate:\u003c\/strong\u003e 1–3 liters per 12 hours (depends on sediment load)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter type:\u003c\/strong\u003e Gravity-fed activated carbon and mechanical filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIn the box:\u003c\/strong\u003e 1x complete system with filter cartridge\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eField notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePre-filter water through cloth before pouring into top chamber—sediment will clog the gravity filter fast and reduce flow to nothing.\u003c\/li\u003e\n\u003cli\u003eHang from hook or branch at least 2 feet above your collection container. Higher = faster drip.\u003c\/li\u003e\n\u003cli\u003eIf flow stops completely, cartridge is saturated. Backflush gently (reverse water flow) or replace cartridge.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How clean is the water?\u003c\/strong\u003e Removes bacteria, protozoa, particles. Some viruses pass through depending on filter grade—boiling is still safer if possible. Never use gravity alone for unknown contamination.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How long does one filter cartridge last?\u003c\/strong\u003e It filters far more water from clear sources than from muddy ones. Silty water clogs it faster, so pre-filter through cloth. Always have spare cartridge.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this in winter?\u003c\/strong\u003e Flow slows dramatically below freezing. Ice forms inside bag and clogs filter. Not practical in true winter unless you keep the bag wrapped and warm.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eCovered by the optional \u003ca href=\"\/pages\/guarantee\"\u003eWatchtower Guarantee\u003c\/a\u003e.\u003c\/em\u003e\u003c\/p\u003e","brand":"Stand Fast Supply Co.","offers":[{"title":"Default Title","offer_id":51726162559205,"sku":"CJYDQTLY00339-1pc","price":84.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0837\/2967\/8565\/files\/gravity-feed-water-system.jpg?v=1789187426","url":"https:\/\/watchtowersupply.com\/products\/gravity-feed-water-system","provider":"Watchtower Supply Co.","version":"1.0","type":"link"}