[Public-List] Water Tank

[Glennb]

Not really, from what I learned recently, most epoxy and FG leach organics into drinking water.  Only a few epoxy and FG products  are EPA certified for use in potable water tanks. For example Sherwin Williams only had two certified epoxy coatings and the smallest 2 part mix was 2 gallons @$200.  

Here is an interesting article about organic solids from epoxies leaching into drinking water. 

http://www.pprc.org/research/epp/Epoxy-Lined_Pipes.pdf

Iam not  sure charcoal filters are any good at removing these organics as the size of the molecule may be so small they could pass right through.  Does anybody know?  Would be interesting to hear if they actually are effective with this stuff. 

Glenn
Dolce 318

Sent from my iPad

On Jul 27, 2013, at 11:40 AM, George Dinwiddie <gdinwiddie at alberg30.org> wrote:

> Their reply sounds a little fishy and self-serving. For one thing, gel-coat is made with polyester resin, not epoxy. Polyester resin does leach into the water, but that's also what our original tanks are made of. 
> 
> George
> 
> Sent from a primitive pocket computer. Please assume all errors are due to that.
> 
> On Jul 27, 2013, at 12:52, "randall weatherspoon " <rlwspoon at earthlink.net> wrote:
> 
>> I finally was able to contact the supplier I had spoke of with the
>> following:
>> 
>> 
>> 
>> Epoxy ( fiberglass or gel coat ) does leach various chemicals into the
>> water.
>> 
>> 
>> 
>> If you have little black specs in the tank - they need to be removed (sanded
>> out) prior to coating as they are probably cobalt which is extremely toxic,
>> whether this is a derivative from the epoxy or  precipitates from the water
>> - don't know.
>> 
>> 
>> 
>> The product they sell is called "NSF" and is certified for potable water
>> tanks and food handling applications.
>> 
>> 
>> 
>> Oceaneering Research & Development
>> 
>> 800-659-8270  St Petersburg FL
>> 
>> Email Will at   Newlander4 at netzero.com
>> 
>> 5 gal ==4resin + 1hardner   > 250sqft - $375.00
>> 
>> They sell smaller quantities.
>> 
>> Recommends 2 coats.
>> 
>> 
>> 
>> Hope this is helpful for all.
>> 
>> Randy   
>> 
>> Marisel #385
>> 
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