Depending on the hardness of your tap water, each filter will produce a different amount of base water to cut with minerals of your choosing to get perfect brewing water at home.
As a rough guide you can use the table below to work out your expected usage:
Bear in mind that by blending in water from your tap or regular filter jug you use for drinking water you will stretch out this volume of water.
ZeroWater's first layer of filtration, activated carbon and oxidation reduction alloy removes the chlorine taste you are accustomed to with tap water. The Ion Exchange stage removes virtually all dissolved solids that may be left over from public water systems or even leached into your water from piping such as Aluminum, Lead, Zinc, Nitrate and more. Three additional stages are included to remove other impurities and to ensure your water receives the appropriate amount of treatment time to deliver a "000" reading on your laboratory-grade Total Dissolved Solids meter included.
Stage 1: Coarse filter to remove fine particles/sediment.
Stage 2: Distributor that maximizes contact time.
Stage 3: Multi-layer system using activated carbon and oxidation reduction alloy.
Stage 4: Comprehensive ION EXCHANGE array.
Stage 5: Non-woven membrane to remove fine particles.
You'll know when it's time to replace your ZeroWater filter cartridge when your TDS meter is measuring 006 or above.