New filter right out of a box of 4 and it doesn’t work! ppm 326! my tap water is 302...? yes the o ring is there and i screwed it in properly. ?..

Have not seen this with any of the filters - on my third one out of the 4 pack. I have found they last a long time before needing to be changed. Maybe try another filter and see what happens. Thoroughly clean everything first.

I just received my filters on august 4. by august 6 the tester reads 16. is this defective filter? there is only one person in household.

The filter normally works between 3-4 months for myself, 2 months when my son is home from college. A failure so quickly can be caused by a number of things; the filter may not be seated in the holder correctly, the filter may not be tightened or the fulfillment company damaged the product before shipping but shipped it anyway. Yes the last one did happen.

Does it contain coconut shells?

I didn't see any coconuts. I have no idea what you are driving at. Coconut shells? Am I missing something?

Whats the difference between the zr-004 filter and the zr-006 filter besides 15 dollars?

Not much 'Google' info available about this, but on the ZeroWater FAQs page, someone asked what the difference was between ZR-001 and ZR-017, and ZeroWater responded with 'just the quantity is different'.

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ZeroWater Replacement Filter Cartridges ZR-004 by ZeroWater

Product ID: 342214246

Details

Item Weight
3.02 Pounds
External Testing Certification
NSF
Brand
ZeroWater
UPC
851510006002
Global Trade Identification Number

💧5-stage filtration tech

🧪NSF certified purity

♻️Activated carbon + ion exchange

Description

💧 Elevate your hydration game with ZeroWater’s ultimate purity filter!

BULK PACK CONVENIENCE - 4-pack ensures you never run out of premium water filtration, perfect for busy professionals.
PURE WATER EVERY POUR - Meets FDA purified bottled water standards for crystal-clear hydration.
TRUSTED NSF CERTIFICATION - Externally tested and certified to guarantee water safety and quality.
ECO SMART CARTRIDGE DESIGN - Activated carbon infused micron cloth combined with comprehensive ion exchange array for maximum filtration efficiency.
ADVANCED 5 STAGE FILTRATION - Multi-layer system with activated carbon and oxidation reduction alloy for superior contaminant removal.

ZeroWater Replacement Filter Cartridges ZR-004 deliver FDA-standard purified water through a sophisticated 5-stage filtration system combining activated carbon, oxidation reduction alloy, and ion exchange technology. NSF certified and available in a convenient 4-pack, these cartridges ensure consistently clean, great-tasting water for health-conscious professionals.

Specifications

ASIN	B0189G52OK
Brand	ZeroWater
Customer Reviews	4.6 out of 5 stars 3,171 Reviews
External Testing Certification	NSF
Global Trade Identification Number	00851510006002
Importer Contact Information	Shop The World B112 Virwani Industrial estate Western Express Highway Goregaon east Mumbai 400063 Email [email protected] www.shoptheworld.in WhatsApp no +919820168421
Item Weight	1.37 kg
Model number	ZR004
Packer Contact Information	Shop The World B112 Virwani Industrial estate Western Express Highway Goregaon east Mumbai 400063 Email [email protected] www.shoptheworld.in WhatsApp no +919820168421
UPC	851510006002

Reviews

T**Y

will buy again

5.01.2026

W**R

Water droplets are normal and are from final testing of product.

3.10.2025

J**S

Makes water taste healthy.

19.12.2025

D**O

Competitive price

13.12.2025

T**N

Pure and perfect water!

22.02.2019

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