ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
*****************************************************************************

We use Physan 20 for its germicidal properties in water and a copper  
ion generator. We also use automatic systems to replace the water  
several times a day and completely drain at night. Our feeling about  
chlorine, bromine and ozone are that they would be fine approaches if  
properly monitored and maintained but that typically doesn't happen in  
a museum exhibit. Also, if you are going to use chlorine (and to a  
lesser extent bromine) you need to consider its long term effect on  
all your O-rings, shaft seals, etc.

On Jun 18, 2009, at 1:45 PM, Earl Stirling wrote:

> ISEN-ASTC-L is a service of the Association of Science-Technology  
> Centers
> Incorporated, a worldwide network of science museums and related  
> institutions.
> *****************************************************************************
>
> depends on the exhibit and it's special needs, we have about 5  
> different
> ways we do it, though they often involve bromine tablets or ozone  
> generators
>
> what are your needs?
>
> I'd prefer to stay away from the halogens like chlorine and bromine,  
> but
> sometimes you need a residual sanitizer...
>
> ----
> Earl Stirling
> Swiss Army Knife
> e x p l  O  r a t o r i u m
> 3601 Lyon St
> San Francisco CA 94123
> +1.415.353.0401
>
>
> On Thu, Jun 18, 2009 at 8:46 AM, Joshua Larson <[log in to unmask]>  
> wrote:
>
>> ISEN-ASTC-L is a service of the Association of Science-Technology  
>> Centers
>> Incorporated, a worldwide network of science museums and related
>> institutions.
>>
>> *****************************************************************************
>>
>> I'm looking for information about how you treat water in your water
>> exhibits.
>>
>>
>> Do you use chlorinators to deliver chlorine?
>>
>> How often do you test the water for chlorine?
>>
>> Do you use ozonators?
>>
>> On average, how often do you replace water?
>>
>> Is there something really important you'd like to share?
>>
>>
>> Thanks!
>>
>> Josh Larson
>>
>> Explora
>>
>> ***********************************************************************
>> For information about the Association of Science-Technology Centers  
>> and the
>> Informal Science Education Network please visit www.astc.org.
>>
>> Check out the latest case studies and reviews on ExhibitFiles at
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>>
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>
> ***********************************************************************
> For information about the Association of Science-Technology Centers  
> and the Informal Science Education Network please visit www.astc.org.
>
> Check out the latest case studies and reviews on ExhibitFiles at www.exhibitfiles.org 
> .
>
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Joe O'Connell
Creative Machines Inc.
3113 East Columbia Street
Tucson, AZ 85714
(520) 294-0939
(800) 861-7937 toll-free in North America
(520) 294-0848 fax

We create objects and environments that encourage
creativity, support social interaction, and inspire self-confidence.

http://www.creativemachines.com
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***********************************************************************
For information about the Association of Science-Technology Centers and the Informal Science Education Network please visit www.astc.org.

Check out the latest case studies and reviews on ExhibitFiles at www.exhibitfiles.org.

The ISEN-ASTC-L email list is powered by LISTSERVR software from L-Soft. To learn more, visit
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