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Line 68: |
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| ===Control=== | | ===Control=== |
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| When requested, chlorine is added via the chlorinator loop and acid is added via the acid pump. Both of these are added post-boiler to minimize chemical interaction (corrosion) with the heat exchanger.
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| Why acid? pH will almost never naturally drop. pH rises due to:
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| * Removal of carbon dioxide from the water. Refer to the chemical reaction for carbonic acid for why carbon dioxide reduces pH. This is be caused by:
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| ** Splashing, which accelerates off-gassing via bubbles.
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| ** Algae, which consumes carbon dioxide (photosynthesis).
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| ** A general desire to be at equilibrium; the carbon dioxide concentration in the water approaches that of the air.
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| ** The addition of non-stabilized chlorine.
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| ** Chemical interaction with the cement-based liner (i.e. marcite).
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| The pH will almost certainly rise faster when the pool is heavily occupied.
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| Decomposition of leaves and acidic rain can lower pH, but these are considered minor contributors.
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