Purifying Tap Water By Removing Practically All Total Dissolved Solids (Tds) Including Heavy Metals And Fluoride, The Four Zerowater 5-Stage Water Filters In This Pack Fit Any Zerowater Dispenser, Jug Or Pitcher, Including The 1.7 Litre Zerowater 5-Stage Water Filter Jug With Free Tds Meter. What Do They Remove? These 5-Stage Filters Remove Virtually All Dissolved Solids From Potable Drinking Water, Including Heavy Metals Such As Lead (99.2%) And Mercury (99.4%) As Well As Chemical Compounds Like Nitrates And Chlorine, And Any Added Fluoride. Which Is Especially Good News If You Have Ancient Plumbing In Your Neighbourhood With Lead Pipes Carrying Your Supply, As Using This Superb Filtration System Means You Can Rest Assured That None Of The Nasties Are Going To Make It Into Your Drinking Water. Effective 5-Stage Filtration Process Once Youve Poured Your Water In, The Filter Gets To Work: Stage 1: Coarse Filter Screen Removes Fine Particles And Sediment. Stage 2: Foam Distributor Spreads Water Across The Whole Filter For More Effective Removal. Stage 3: Multi-Layer Filtration With Activated Carbon To Filter Out Contaminants And An Oxidation Alloy To Remove Chlorine And Heavy Metals. Stage 4: Dual Ion Exchange Resin Strips Foreign Ions From Water Molecules. Stage 5: Ultra-Fine Screen And Non-Woven Membrane Layers Remove Remaining Ultra-Fine Particles. How Long Does Each Filter Last? Each Filter Will Turn Up To 150 Litres Of Tap Water Into Zerowater, But This Depends On The Original Quality Of Your Tap Water And The Amount Of Dissolved Solids, So They Will Last Longer In Soft Water Areas. In The Box Zerowater Ion Exchange Filter Laboratory-Grade Total Dissolved Solids Water Quality Meter Full Instructions Made From Durable Polypropylene And Abs Plastics, The Jug And Its Filter Are Bpa Free. About Zerowater Zerowater Is The Only Gravity-Fed Water Filtration System To Match The Purity Of The Very Best Filtered And Bottled Water, By Capturing 99.6% Of Total Dissolved Solids, Including Residual Minerals That Can Be Prevalent In Regional Groundwater And Run-Off Compounds That May Leach Into Water Supplies, Especially After Heavy Rainfall. This Breakthrough Filtration System Is Certified By Nsf International* To Remove Lead And Other Heavy Metals, While The Good Housekeeping Research Institute Recognise That Zerowater Removes More Total Contaminants Than Other Brands Of Water Filter. *Nsf International Are An Independent Organisation, Internationally Recognised As Experts In Public Health And Safety Issues And As Their Testing Processes Are Extremely Rigorous, Gaining Certification From Them Is Highly Prized.