Meridian Designs AquaStar Plus Ultraviolet Light Water Purifier REVIEW

I have friends who are pleased with the Steripen, but had bad luck with earlier models of the Aquastar. Anyone have experience with current models of both?

Interesting that there’s nothing in the performance section on how well this thing actually did in cleaning your water.

That’s probably difficult to test but I have questions like: Does the wet filter saturated with contaminated water increase the likelihood of depositing pathogens on one’s hands or other gear? Can it work with a 96oz Nalgene canteen, 48oz, or just the smaller ones? Does one do three cycles for 96oz? Does it remove protozoa? viruses? bacteria? What government standards does it meet?

One other thing is the business about “Severely affected by moderately cold air and water temperatures.” There was no mention of that elsewhere in the review. I see on their web site that it recommends two treatments for water colder than 40 degrees Fahrenheit. But it doesn’t say whether that’s the water temp or the air temp.

Seems to me that the temperature thing means it is less effective on water that’s 50 degrees than it is on water that’s 70 degrees. What temperature(s) were treated to get the “>99.99%” effectiveness cited on their web site?

I tried to find the EPA manuals cited by the company, without success. I did find some apparent references to it that raise some issues in my mind: It is aimed at treating drinking water systems, not necessarily water free-flowing streams and lakes; and there are lots of factors that influence the effectiveness of UV.

Sorry to be so skeptical.

I’ll try to respond to some of your questions, as I’ve used an AquaStar Plus for two seasons now and have done limited review of technical materials on UV.

There are no restrictions regarding container material for use with the AquaStar–only that treatment time be commensurate with the water volume. I’ll add that container shape should be considered to keep the water within a reasonable distance from the tube (e.g., avoid very wide containers). I leave some airspace so that slow agitation creates good circulation during treatment.

I primarily use mine with either a bicycle bottle or a 48-ounce Nalgene Cantene. The supplied 1L bottle is a little bulky and heavy for me as a backpacking bottle.

Temperature limitations are based on the water temperature, not air temperature (although the electronics, if left out in freezing temps, should be warmed up first to work correctly). In my experience, the unit will work in cold water so long as the batteries are relatively fresh. If they’re not, I have to warm the water first, usually inside my jacket, otherwise it won’t complete a cycle. It gives a clear error code when it’s not cycled completely.

As a general guideline, for very cold water, particularly suspect water, or turbid water, doubling or even tripling the cycle might be appropriate. I’ve not often felt the need, but always let conditions and location dictate. Staying with the best source water available is always my goal, no matter how I’m treating (or not).

UV will inactivate bacteria, viruses and cysts (including giardia and crypto). Its fast inactivation of cysts puts it ahead of chemical treatment, and its effectiveness against viruses puts it ahead of almost all filters. And of course, it doesn’t affect taste.

But as with any water treatment system, UV isn’t for everybody or every situation. I’ve developed a preference for the AquaStar in the time I’ve been using one, but haven’t completely abandoned filters or chemical treatments either. Will also be very interested to see the new Steripen we previewed at the show!

I would appreciate a look into the effectiveness of these treatment measures. I’m fine just considering this review to be a review of “what it’s like using this product,” but I hope that eventually BPL will perform their own tests so we don’t have to take the manufacturer’s claims. The editor’s commitment to cutting through marketing BS has always been one of this website’s strong points.

Ben

>There are no restrictions regarding
>container material for use with the
>AquaStar

The user manual sez: “UV-C light can cause irritation to the eyes and skin if exposed for an extended period (over 6 minutes at 1ft distance). The UV-C light is absorbed by the plastic bottle…” and “The AquaStar Plus! bottle provides 100% shielding of any UV-C light”.

I wonder if that means their bottle is at all “special.” Does the shielding bounce the UV back or absorb it? Does the UV escape a Nalgene canteen and thus not provide a high enough dosage to kill the pathogens? Are the UV-C levels referenced in their “efficacy” document based solely on use with their bottle, or using a variety of containers? Does the UV-C dosage vary depending on the container?

BTW, I’m not so much asking questions about the device itself as suggesting that the review should have been more, um, “inquisitive” about the pertinent performance aspects of the device. If I *was* considering using this thing to treat my water then I’d want a little more info. (NB: I hike in the Sierra where no treatment is necessary, at least according to my risk/benefit analysis, so I’m not considering it.)

And the shortcomings of the user manual should have been mentioned, regardless. Obviously, it doesn’t provide nearly the information one needs to use the product effectively in the real world conditions most readers will experience. Unless said use is solely to assuage one’s misplaced fears, which perhaps it is :-).

Thanks Ken for the review.

I have just one comment to make: In your list of “What’s Not So Good”, you mention that the unit uses non-rechargable CR-123 batteries.

For what it’s worth to all who have (or are considering) this unit, rechargable lithium CR-123 batteries are available. One possible source is Thomas Distributing (see http://thomasdistributing.com/delkin-rcr-123a-rechargeable-charger.htm#top).

Regards,
PLR

I neglected to answer this question earlier. Some of you have already found the informatin on the website for the AquaStar Plus that includes references to the EPA document 815-D-03-007. That document has moved around a bit on the EPA site and is not immediately obvious. It can be found at Ultraviolet Dininfection Guidance Manual. Their are other doucments on the EPA site that you might find of interest, in particular, the somewhat older 815-R-99-014.

I have been using the steripen and find it to satisfactory for my needs. Many of your questions can be answered at their site. They even offer the microbial studies for your review. I was still skeptical so I turned to my wife-who is a microbiologist- and she reminded me that UV light is used extensively in the lab to sterilize their working areas. OK I have to trust her after all we have been married for 22 years and if she wanted to do me in it would have been sooner.

The UV light can’t hurt you through the bottle, it is even reflected back where the water meets the air.

The only limitation that I have found was if you travel in groups of 4 or more. I found that mechanical filtration was faster for the increased volume of water we needed. You do need to be careful about using turbid water. Since the filter uses light, cloudy water will not give you an adequate dose. The temperature limitations as far as I have read relate to the batteries and electronics not the water. I would suggest placing the entire unit in your coat pocket before use if the temp is low.
I found that using a nalgene bottle with a pre filter and dumping the treated water into a soft-sided canteen worked well.

I just found out about the aquastar and it is lighter than the steripen (mainly because of using button batteries-instead of AA), but I’m happy with my choice. I feel more confident after reading the extensive testing and safety features on their web-site.

I hope this helps.

Dave

Thanks Ken, lots of reading there.

I have been happy with the Aquastar and have been tempted by the steripen Adventurer, but after dropping the nalgene bottle (with aquastar attached) on to a hard surface and the aquastar still working I think I will pass on the adventurer.

Certainly UV disinfection means less water carried in the wet NE