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The
simplest method for removal of carbonic acid is to pass
the water through a tank containing limestone chips. A
neutralizing filter of this type affects the carbonic
cid just as does the underground limestone formation.
The limestone in the filter reacts with the carbonic
acid to produce calcium bicarbonate.
Where
high carbon dioxide concentrations are encountered, a
solution of soda ash-sodium carbonate (Na2CO3) - may be
fed into the water.
This
method, as we have seen, has the disadvantage of
requiring more attention in the preparation and
maintenance of proper feeds.
Where
water is obtained from a private well, a small positive
displacement pump can be used to feed the soda ash
solution into the water.
Normally
such pumps are wired to act in conjunction with the
operation of the well pump. This permits the
proportioning of the solution with a good degree of
accuracy.
It
is important to feed soda ash solutions into the water
in advance of some type of tank or mixing device. This
is necessary to provide for reasonably consistent
concentrations in the water to be treated. The type of
pressure tank utilized in connection with most private
water systems is adequate for this purpose.
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