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    Gravity & Carbon Units

    Gravity-fed systems for countertop use

    Gravity-fed systems and pitchers need no electricity or plumbing — water moves through filter elements by gravity. Compare product dimensions, capacity, maintenance, and current documentation.

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    Replacement

    7 products

    Prices are the seller's listed price or range when we checked, not a promise. Replacement intervals are as listed by the seller (6 of 7 list one).

    Coming Soon

    Pitchers & gravity · Coming Soon

    HU Portable Glass & Stainless Filter Pitcher

    A portable borosilicate glass and food-grade stainless filter pitcher, intended for chlorine, taste, odor, and larger or visible particles only. Target price $179. Not available to purchase yet.

    Target price $179 · Coming soon · not available to purchase yet

    See the listing
    PartnerBoost gravity picks

    Purewell gravity systems and filters

    Brand and product listings, not HU product reviews. Confirm each listing’s details before purchasing.

    These are affiliate links. Hydrology University may earn a commission if you buy through them, at no extra cost to you.

    Purewell stainless steel countertop gravity water filter system with its water level window on a kitchen table
    PartnerBoost · Purewell store

    Purewell Water Filtration

    Gravity-fed countertop filter systems, portable RO and replacement cartridges from Purewell's own store.

    Purewell's range centers on stainless steel countertop gravity systems (K, SS, SF and BO Series) that run without electricity, water pressure or plumbing. Purewell lists its K Series system at 2.25 gallons in 304 stainless steel with a built-in water level window, sized for 3–5 people. It also sells a rechargeable 10-stage portable RO system (model K8680) for camping, RV and emergency use, countertop and under-sink RO systems, and replacement filters.

    Current codes (valid through 12/31/2026)

    • PURE15 15% off your first order
    • SAVE60 $60 off orders of $300 or more
    • Purewell20 20% off eligible countertop systems (filters, portables and accessories excluded)

    Gravity systems filter slowly, and Purewell states its K Series carbon filters do not reduce TDS; if dissolved solids are your concern, look at RO instead. Before buying, check the manufacturer-listed certifications and test documents Purewell posts for the exact model, and plan for filter replacement on Purewell’s listed schedule.

    Partner listing: Purewell Water Filtration

    K Series carbon filters

    Also on Amazon: Purewell's Amazon storefrontReferral

    Purewell K Series ceramic replacement water filter elements with their retail box and a cleaning pad
    PartnerBoost · Purewell product

    K Series Ceramic Replacement Filters

    $79.99–$99.99price checked Nov 2, 2026

    Estimated price at the time we checked; the seller's price may have changed.

    Ceramic replacement filters for Purewell K Series and SS Series gravity systems.

    Two versions are sold: the 3-Stage Advanced (item K8013) and the 4-Stage Reduces PFAS (item K8091). One box holds two filter elements. The ceramic surface is reusable and washable rather than disposable.

    Both versions fit Purewell K Series and SS Series gravity systems. The 3-stage and 4-stage versions differ in how many filtration stages the element carries, so pick the one that matches what you want the filter to do. Prices can change at the seller — confirm the current price and the version you are buying before you order.

    Partner listing: K Series Ceramic Replacement Filters

    Check today's price Referral

    Customer & expert reviews

    • "Customer support was excellent and very responsive. Purewell has an outstanding product, highly recommended."

      ★★★★★ n.P., verified buyer, K Series Specialty Add-On Filters, Purewell.com (brand site), Aug 2026

    • "Great filters. Pity that I couldn't make a yearly subscription!"

      ★★★★☆ A.K. (France), verified buyer, 5-Stage Reduce Fluoride, Purewell.com (brand site), Aug 2026

    • "It's a nice little unit. They seem to be really well built."

      Ana's Food & Lifestyle, 2.25-gal system with fluoride add-on filters, YouTube, Nov 2025 (unit provided by Purewell)

    • "If you’re looking for a gravity-fed water filter that works without electricity and costs less than some well-known brands, the Purewell system is a practical option to consider."

      Ken Jorgustin, Modern Survival Blog, Feb 2026

    • "Overall, we are very satisfied with the Purewell 3-Stage Ultra-Filtration Gravity Water Filter System. It has exceeded our expectations in terms of taste and quality, particularly for the price point."

      GravityWaterFiltersReviews.com

    The Purewell.com reviews come from the brand's own website. The two third-party reviews and the YouTube review cover Purewell's gravity systems, not the add-on filters alone.

    How to Choose: Gravity & Carbon Buyer's Guide

    Element quality is everything

    Filter element specifications and replacement intervals vary. Consult current manufacturer documentation for the model you are considering.

    Throughput for your household

    Gravity is slow. A two-element system serves 1–2 people comfortably; add elements or choose a larger chamber for a family.

    Published test data

    Review documentation for the exact model and understand what any published testing covers before relying on performance claims.