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PUR vs. ZeroWater

PUR vs. ZeroWater

Two of the most popular water filtration brands go head to head in this article. Below you will find a comparative analysis looking at effectiveness, design, cost, durability and taste. As with our other head to head match-ups, we make a clear recommendation.

For the purposes of accurate comparison, we will look at the 23 cup ZeroWater dispenser (ZD-018) and the PUR 18 cup dispenser (DS-1800Z), because they have a similar capacity and design.

Which filter is more effective?

Answering this question is always difficult, because there are different categories of contaminants. ZeroWater puts a digital meter on their products that measures the amount of Total Dissolved Solids (TDS), and in their marketing material this is what they focus on.

However, what ZeroWater fails to mention is that their TDS meter focuses solely on inorganic substances. Furthermore, they don’t mention that their filter also removes beneficial minerals like calcium and magnesium. In other words, cysts and other organic contaminants may not be removed in sufficient quantities. PUR, on the other hand, does remove harmful organic contaminants.

ZeroWater may have had an edge in lead removal when they first released their products. Their ion exchange filter proved to be more effective in removing lead than the filters of Brita and PUR. However, PUR has since upped their game, making the claim that their filters reduce 99% of lead (we admittedly do not have independent verification of this).

No pour-through filter is capable of completely removing lead. Lead levels should already be adequately low (in terms of safe consumption) depending on your piping and your water hardness/softness. A filter will reduce the levels further, but not 100%.

There are a few other claims to examine in terms of effectiveness. ZeroWater has been certified by NSF to remove Chromium while PUR has not. It is unclear whether sufficient testing has been done on PUR products to determine where they stand.

Finally, there is the issue of traces of pharmaceuticals. This has become more and more of a problem in recent years, and PUR has a clear edge here. The ZeroWater filter is simply not designed to reduce the levels of pharmaceuticals. Furthermore, ZeroWater will not reduce contaminants like MTBE.

In conclusion:

  • ZeroWater may reduce more overall inorganic dissolved solids. This comes at a cost, however, as calcium and magnesium will also be reduced.
  • With heavy metals, we can say ZeroWater has a slight advantage, but the difference may be negligible.
  • Both filters will reduce levels of chlorine, but neither will remove it entirely.
  • In terms of removal of harmful organic compounds, PUR has a clear advantage.

Winner: PUR by a hair


PUR and ZeroWater both advertise their products as well designed and highly functional. If you listen to consumers, however, one company is clearly outperforming the other. If you just take a look at the Amazon.com reviews, PUR has a clear advantage. For the pitcher filter in question, ZeroWater has an average four star rating with over 1,500 reviews. PUR has nearly 3,000 reviews and a 4.5 star rating. The most often cited issue with ZeroWater filters concerns their design.

ZeroWater filters are criticized for having a faulty spigot, filtering too slowly, and having a shape that is too tall for most conventional refrigerators. In our own personal test of the two filters, we found the PUR pitcher filter to be more efficient and easier to use overall.

Winner: PUR


ZeroWater and PUR filters are comparably priced, and while ZeroWater is a few dollars more, it also has slightly larger capacity. However, there is one area where ZeroWater becomes quite costly: the replacement filters. ZeroWater replacement filters are more expensive than those of PUR. What’s more, according to consumer testimony, you need to replace the cartridges for ZeroWater much more often. In fact, some consumers report having to replace them on a near-weekly basis. This could add up quickly. Once again, PUR has the edge.

Winner: PUR


Both of these products should be able to stand the test of time. While there are always a handful of people that end up with lemons, that is more an issue of bad luck than poor product design.

However, once again we have to point out that there have been repeated issues with the spigot on some of the ZeroWater dispensers. Many customers have reported that the spigot breaks easily or leaks. You see some of the same complaints for the PUR DS-1800Z, but far fewer overall. As we said earlier, the number one complaint for the ZeroWater dispenser concerns design, and this certainly has an effect on its durability.

Winner: PUR


This is one category in which ZeroWater may actually have an advantage. Due to its ion exchange filters, ZeroWater removes more dissolved solids, including minerals like magnesium and calcium, and produces water that is slightly acidic. The slightly acidic water is often rated higher in taste tests.

However, as we say throughout the site, taste can be a deceiving metric of water purity. It’s something that is important to consider, but it should never be a decisive factor.

Winner: ZeroWater

Overall Winner: PUR

In conclusion, the evidence is overwhelmingly in favor of PUR filters when compared to those of ZeroWater. If you have any thoughts on the matter, please reply in the comments below. Both products certainly have their supporters, and if there is anything we have missed, do let us know about it.

{ 4 comments… add one }

  • David December 26, 2015, 7:55 am

    This is a terrible review and, to be honest, has all the characteristics of fraud review site (with misleading domain name). None of the reviewed criteria is backed up by any numbers or scientific research. For instance, the writer makes a bold claim that, “PUR has since upped their game and now reduces lead at comparable level” without a single shred of evidence. The only time when such data or number is mentioned is when the popularity of their “designs” are discussed — meaning, # Amazon’s reviews.

    I’ve been a long Pur buyer (since 2000) and had several of their products, but this phony site makes me highly suspicious that the company must be hiding something (I also noted that Brita has something similar to this in AU). Needlessly to say, I will no longer be dealing with companies pulling shady cheap PR stunts like this.

    • waterhq December 28, 2015, 4:51 am

      Hey David,

      This is absolutely not a PR site for PUR. The fact is, we don’t have a lot of data to go on for some of the claims, and you’re right the lead claim is a bit flimsy because it uses PUR’s own results ( I will change this now ). However, I do not trust some other sources, such as Natural News, which has been shown in the past to be manipulative. NSF is generally the best in terms of objectivity, and I acknowledge that NSF certifies ZeroWater to remove chromium but does not do the same for PUR. We are admittedly biased towards PUR, but this is not a PUR pr site or anything like that. We do make some money on affiliate products through Amazon, but not just PUR products. We also recommend certain Reverse Osmosis Systems that are not made by PUR, as well as shower water filters. Anyway, thanks for the input.

      • . November 22, 2016, 4:52 pm

        unless u r doing your own independent lab tests, then i’d be suspicious of solely going by what each product claims it does. the products could be using false advertising…

  • Theresa October 21, 2017, 8:23 am

    I’ve had my zero for 4 months and haven’t had to change the filter yet. We are a family of 4 and southern to boot so we love our ice tea. I bought 2 estar filters when I bought the system because of Amazon and haven’t had to use them yet.

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