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Is salt water used with the pools, slides and spash areas?


LongHill44
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Would make sense as it would cut down on cost as well as provide a more consistent clean level of water.

 

Does anyone know?

 

Older ships use salt water in most pools, some of the kids pools were fresh water, as you say, because it is free, and when outside of 12 miles from shore, it can be switched to "flow through" mode, and no chemicals or the chemical dosing equipment is needed. Flow through continually pumps sea water into the pool, and the excess flows from the rim gutters back to the sea. Since there is no recirculation of the water, and the pumping rate provides an adequate turn-over rate, no chemical sanitation is required.

 

However, all pools, whether salt water or fresh, when within 12 miles of shore, must be on "recirculation" mode, where the water is pumped from the pool to a filter and back to the pool. Any pool in recirculation mode, whether salt or fresh, must have chemical sanitation (chlorine) added.

 

Because during the transition between flow through and recirculation modes, the chlorine level will not meet the standards, the pools must be closed during this time, until the residual chlorine level reaches the required. This can take 2-4 hours depending on the volume of the pool. In order to minimize the disruption of passenger activities caused by closing the pool for this change over, most ships will not switch a salt water pool to flow through unless there are 2 or more sea days in a row, so the change can be done late at night. So, one of the advantages of sea water is negated, if the sea water pool is kept on recirculation mode all the time. This is why newer ships tend to have fresh water pools, as the disadvantages of fresh water are less than originally planned, and the savings in maintenance and construction (less costly piping) balance things out.

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Older ships use salt water in most pools, some of the kids pools were fresh water, as you say, because it is free, and when outside of 12 miles from shore, it can be switched to "flow through" mode, and no chemicals or the chemical dosing equipment is needed. Flow through continually pumps sea water into the pool, and the excess flows from the rim gutters back to the sea. Since there is no recirculation of the water, and the pumping rate provides an adequate turn-over rate, no chemical sanitation is required.

 

However, all pools, whether salt water or fresh, when within 12 miles of shore, must be on "recirculation" mode, where the water is pumped from the pool to a filter and back to the pool. Any pool in recirculation mode, whether salt or fresh, must have chemical sanitation (chlorine) added.

 

Because during the transition between flow through and recirculation modes, the chlorine level will not meet the standards, the pools must be closed during this time, until the residual chlorine level reaches the required. This can take 2-4 hours depending on the volume of the pool. In order to minimize the disruption of passenger activities caused by closing the pool for this change over, most ships will not switch a salt water pool to flow through unless there are 2 or more sea days in a row, so the change can be done late at night. So, one of the advantages of sea water is negated, if the sea water pool is kept on recirculation mode all the time. This is why newer ships tend to have fresh water pools, as the disadvantages of fresh water are less than originally planned, and the savings in maintenance and construction (less costly piping) balance things out.

 

 

This is interesting. Thank you for explaining the differences in how they affect the ship and the cost effectiveness. I had always wondered and speculated that sea (salt) water was the most cost effective way to maintain ship pools. Now I know!

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Older ships use salt water in most pools, some of the kids pools were fresh water, as you say, because it is free, and when outside of 12 miles from shore, it can be switched to "flow through" mode, and no chemicals or the chemical dosing equipment is needed. Flow through continually pumps sea water into the pool, and the excess flows from the rim gutters back to the sea. Since there is no recirculation of the water, and the pumping rate provides an adequate turn-over rate, no chemical sanitation is required.

 

However, all pools, whether salt water or fresh, when within 12 miles of shore, must be on "recirculation" mode, where the water is pumped from the pool to a filter and back to the pool. Any pool in recirculation mode, whether salt or fresh, must have chemical sanitation (chlorine) added.

 

Because during the transition between flow through and recirculation modes, the chlorine level will not meet the standards, the pools must be closed during this time, until the residual chlorine level reaches the required. This can take 2-4 hours depending on the volume of the pool. In order to minimize the disruption of passenger activities caused by closing the pool for this change over, most ships will not switch a salt water pool to flow through unless there are 2 or more sea days in a row, so the change can be done late at night. So, one of the advantages of sea water is negated, if the sea water pool is kept on recirculation mode all the time. This is why newer ships tend to have fresh water pools, as the disadvantages of fresh water are less than originally planned, and the savings in maintenance and construction (less costly piping) balance things out.

 

Thanks for the info, always like leaning.

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