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post #3 of Old 11-11-2007
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Dohen...there is a good article on building tanks on the West system website (search there for "potable") but it does not look like a good idea to do at home for potable water systems:

Considerations for potable water

We have adopted the broad policy of not
recommending epoxy for drinking water
tanks because of regulatory and safety issues.
The potential problems outweigh
the benefits. To date, none of Gougeon
Brothers’ epoxies meet FDA regulations
or any other drinking water certified approval.
The major long-term concern
with any plastic water tank is extractives
leaching out in the water. Off-ratio,
poorly cured epoxy can release extractives,
as noted above. In the fabrication of
water tanks and food handling equipment,
the successful use of epoxy requires
thorough mixing and adequate
elevated temperature post-cure to assure
themaximum cross-linking and cure of
the polymer. These process controls are
not always possible with the home-built
tank. Unfortunately, neither Gougeon
Brothers, Inc. nor any certification
agency can verify the level of quality
control exercised in the fabrication of
the tank.

There is an excellent thread on your issues over here:
which indicates it CAN be done, but note all the cautions in the thread as you make your own decision.
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