If your ZeroWater suddenly tastes sour or a little like lemon, the most likely cause is simple: the filter has reached the end of its life. Here is a quick way to check, and what to do next.
Short answer: the filter is likely used up
When a filter has done all the work it can, dissolved solids start to pass through, and that can change the taste of your water. A sour or lemon-like taste is a common sign. The fix is usually a new filter. A change in taste or smell is one of the signs ZeroWater lists for replacing the filter.
Check 1: test with your TDS meter
Use the included ZeroWater TDS meter on your filtered water. ZeroWater recommends replacing the filter when the meter reads 006 or higher. New to TDS? Here is what the numbers mean.
Check 2: are you filtering cold tap water?
Fill the pitcher or dispenser with cold tap water. Warm or hot water is not recommended for the filter.
Check 3: rinse the pitcher and parts
Take the pitcher apart and rinse the reservoir, lid, and other parts with water, then reassemble and filter again.
Check 4: is the filter seated firmly?
Make sure the filter is twisted firmly into place and the blue cap from a new filter has been removed.
If it still tastes off, contact support
If the meter reads 006 or higher on a brand-new filter, or the taste does not improve, contact ZeroWater support. Filters with a manufacturing defect are replaced free within 30 days of purchase, per the warranty.
How to keep it from happening again
- Test your filtered water with the meter every so often.
- Change the filter as soon as the meter reads 006 or higher. See when to change your ZeroWater filter for how long filters typically last by tap water TDS.
- Keep a spare on hand with auto-delivery.
Shop ZeroWater replacement filters
Frequently asked questions
Why does my ZeroWater taste like lemon?
It usually means the filter is at the end of its life. Test with your TDS meter and replace the filter if it reads 006 or higher.
Is a lemon taste a sign my water is unsafe?
The taste is a signal that the filter needs replacing. If you have concerns about your water, contact your local water utility or ZeroWater support.
Do I need to rinse a new filter first?
No. ZeroWater filters do not need to be soaked, flushed, or prepped before use.
How often should I replace my filter?
It depends on your tap water and how much you filter. Use the meter, and see our filter life guide.
