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We’ve mentioned caustic soda earlier on in

We’ve mentioned caustic soda earlier on in this piece and it’s with good reason if that doesn’t work for you, pick up some good old fashioned. High-efficiency sealed-combustion units generally produce an acidic exhaust gas that is not suitable for old, unlined chimneys, so the exhaust gas should either be vented through a new duct or the chimney should be lined to accommodate the acidic gas (see the section on maintaining.

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