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  • Inline Alkaline Filter – 1/4" and 3/8" Quick Connect (SKU# ALK-QC)

Inline Alkaline Filter – 1/4" and 3/8" Quick Connect (SKU# ALK-QC)

$22.5 $42.75
Description ALK-QC Inline Alkaline Filter ✅ Raises pH to ~ 8.4–9.3 ✅ Smoother taste mineral balance ✅ Final stage after RO ✅ Push-to-connect Purpose Increases the pH level of RO water to approximately 8.4–9.3 to improve taste and add beneficial alkaline properties. Drinking alkaline water helps restore natural mineral balance after filtration, supports optimal hydration, and improves taste. A higher pH may help neutralize acidity in the body, support digestion, reduce acid reflux symptoms, and promote overall wellness with smoother, more refreshing drinking water. Ideal For Countertop and under-sink RO systems (as a final stage) Alkaline drinking water Applications requiring enhanced mineral balance and a smoother taste Use after the RO membrane and carbon polishing filter (T33) Content / Media Composition Calcite (Calcium Carbonate) – adds essential calcium and helps stabilize pH FIR (Far Infrared Ceramic Balls) – supports improved water structure and absorption Alkaline Ceramic Balls – enhances alkalinity and raises pH Tourmaline Balls – contributes to ORP reduction and mineralization Magnesium Media – naturally boosts pH and adds trace minerals Flow Direction Water enters from IN and exits from OUT toward the faucet or dispensing line. Used as the last stage in RO systems. Quick Specs Max Pressure 80 PSI Temperature Range 36–100 °F Connection Type 1/4″ OD Quick Connect or 3/8″ OD Quick Connect (via 2 elbow adapters) SKU / Reorder ALK-QC Lifespan 300–500 gallons or ~3–12 months (varies by water quality) Important Use only with cold water Manufactured By AquaJB �� Installation Tips Tubing Size Most RO systems use 1/4″ OD tubing (standard RO size). Some countertop RO systems and specialty setups use 3/8″ OD tubing. Tubing size refers to the outside diameter (OD) of the tube. When Do You Need Elbow Adapters? Select 3/8″ OD Tubing if your system uses larger tubing. We include 2 elbow adapters to connect the filter to 3/8″ OD tubing. ✔ No tools required   ✔ Push-to-connect installation When Do You Need a T-Fitting? A T-fitting (1/4″ stem × 1/4″ OD × 1/4″ OD) can help if you are: Adding the inline filter to an existing 1/4″ RO line Wanting an easier install with a clean branch connection Installing between tubing lines without reworking your layout ✔ Optional accessory   ✔ Makes installation easier for some setups Not Sure Which Option to Choose? If unsure, select 3/8″ OD Tubing. The filter comes with 1/4″ connections, and we include two elbow fittings for 3/8″ OD tubing in the package. Message us before ordering—we’ll help you pick the right fittings. ▶️ Video Installation Guidance Because RO systems and plumbing layouts can vary, there are multiple valid ways to install an inline filter. Search YouTube for “inline RO filter installation” Choose a video that matches your system type (under-sink RO, countertop RO, post-filter installation, etc.) Visual step-by-step videos can make installation easier and faster.
Single Filter Cartridges

Single Filter Cartridges

  • Inline Far-Infrared Re-mineralization Filter Cartridge (58 Minerals) , size: 10" x 2", 1/4″ and 3/8″ Quick Connect (SKU# MINERAL58-QC)
    $26.96 $43.4
  • Inline DI Mixed Bed Filter, Made in USA, NSF Certified (SKU# K2555-BB)
    $21.6 $32.18
  • Inline Premium DI Ion Exchange Filter (close to 0 PPM), 1/4″ & 3/8″ OD Tubing Connection (SKU#: H-F1035DI)
    $17.95 $28.55
  • Inline DI Deionization Filter (For Ultra-Pure Water), 1/4" & 3/8" OD Tubing Connections (SKU# DI-QC)
    $17.91 $30.63
  • Inline GAC T33 carbon filter, NSF Certified, Made in USA, 1/4″ & 3/8″ OD Tubing Connections (SKU# CL10ROT33-B)
    $12.6 $18.52
  • Inline PureT IL-10W-S5-EZ14 Sediment Water Filter – 5 Micron | 2″ × 10″ Standard Size | 1/4″ Tubing Connection, SKU# IL-10W-S5-EZ14
    $17.67 $21.56
  • Premium DI Ion Exchange Filter, 3 different media: 1/2 DI, 1/4 KDF-85, and 1/4 GAC T33 Carbon (SKU# H-F1035DI-KDF85-T33)
    $21.6 $33.7
  • 3-in-1: Alkaline (raise pH level), ORP and Tourmaline inline filter, 2"x10", 1/4″ and 3/8″ Quick Connect (SKU# 3IN1-MAF)
    $22.5 $42.75
  • Inline Softener Filter Cartridge – 2.5″ × 11″ (SKU# K5654-BB)
    $19.71 $33.11
  • 4-in-1 Remineralization Filter Cartridge, 2″x10″, 1/4″ and 3/8″ Quick Connect (SKU# MINERAL4IN1)
    $22.5 $32.85
  • Inline Calcite (Alkaline/Acid Neutralization) filter, made in USA, NSF Certified, 1/4" & 3/8" OD Tubing Connections (SKU# K2548-BB)
    $17.01 $26.37
  • Add extra stage: 3-in-1: Alkaline (raise pH level), ORP and Tourmaline Inline Filter, 2″x10″ (SKU# 3IN1-MAF-STAGE)
    $24.3 $33.05
  • Inline Coconut Carbon GAC T33 Post Filter – Taste & Odor Improvement, 2" × 10", 1/4″ & 3/8″ OD Tubing Connections (SKU# IL-10W-C-14)
    $33.56 $63.09
  • Inline GAC T33 with KDF-55 Inline Filter (antibacterial) , NSF Certified, Made in USA, (SKU# K2567-BB)
    $21.6 $35.42
  • Inline GAC T28 Coconut Carbon Filter, NSF Certified, Made in USA, (SKU# CL10ROT28-B)
    $12.6 $19.78
  • Inline Alkaline Filter – 1/4" and 3/8" Quick Connect (SKU# ALK-QC)
    $22.5 $42.75

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