When should I replace my ZeroWater filter?Updated 3 months ago

Use your TDS meter, not a calendar

Unlike many other filters, ZeroWater filters don't have a fixed lifespan based on months or litres. The only accurate way to know when to replace your filter is to test your filtered water with the included TDS meter.

The replacement rule

• 000–005: Filter is working perfectly. No action needed.
• 006 or higher: Replace your filter. At this point, dissolved solids are starting to pass through.

How long does a filter typically last?

Filter lifespan depends entirely on your local tap water quality. The higher your tap water TDS, the more work your filter does — and the sooner it will need replacing.

• Tap water TDS 000–001: Clean water
• 002–050 (low): 150+ litres per filter
• 051–200 (average): 100–150 litres per filter
• 201–300 (high): 50–100 litres per filter
• 301–400 (very high): 30–50 litres per filter
• 401+ (extremely high): Under 30 litres per filter

Test your tap water occasionally with the TDS meter to understand your local water quality.

Why does my filter run out faster than expected?

If you're replacing filters very frequently, it's likely because your local tap water has a high TDS reading. This is normal — the filter is simply doing more work. Consider our multi-pack filter bundles or filter subscription for better value.

How do I buy replacement filters?

Replacement filters are available on zerowaterfilter.com.