What TDS level should I aim for with green tea?
For most green teas, a range of 30–60 ppm works best. Too high and the delicate umami can turn metallic; too low and the tea feels thin. Adjust in small steps and trust your palate.
Can I just use bottled spring water instead?
Yes — bottled spring water with a known mineral content is a reliable starting point. However, a filtration jug and mineral stones give you control to fine-tune and reduce plastic waste.
How often should I replace the filter cartridge?
Most jugs specify a cartridge life of 4–6 weeks or 150 litres, whichever comes first. For tea brewing, where water quality is paramount, consider changing a little earlier if you notice any off-odours.
Do the mineral stones expire?
Mineral-adding stones can be reused for many months, but they gradually lose their leaching capacity. Refresh them every 6–8 months with heavy use, or when your TDS meter shows a drop, even after a long soak.
Will a TDS meter tell me if my water tastes good?
Only partly. TDS meters measure total dissolved solids, not specific tastes. They are excellent for consistency and calibration, but you still need your senses — smell, taste, and mouthfeel — to judge the final result.
Is filtered tap water safe for gongfu brewing?
Yes, provided the filter is effective against chlorine, heavy metals, and particulates. Filtered tap water often makes a cleaner foundation than many bottled waters, because you can then dial in the mineral profile yourself.
Can I use the same water for all tea types?
While one water can work for many teas, you’ll miss out on subtle distinctions. Harder water can make delicate whites taste soapy, while soft water flattens rock oolongs. Tuning water to tea type is the refinement that separates a good cup from a great one.