In various locations, typically just above the water surface, a hard white scale can build up on glass and other surfaces.  This can be a mixture of precipitated calcium carbonate and dried salt from the salt water.  It can be difficult to remove, especially if it is left for long periods of time between removal.  Similar build ups can also occur within pumps, which should be removed as part of the regular maintenence.

The best method for removal is using an acid such as vinegar, by submerging the object in an acid solution for a hour or so.  This works well with equipment like pumps, which can simply be placed in a bucket of vinegar solution over night. The faster that you want the scale removed, the more concentrated vinegar you use.  So if time isn't a real big factor, then you can dilute it down with tap water and make the bottle of vinegar go further.

If using vinegar doesn't remove the scale, then you need to use a stronger acid.  Hydrochloric acid is perfect for the job, as it is readily available from a hardware store and will remove even the most stubborn scale in a short period of time.  It may also be called muric acid.

Warning, hydrochloric acid is a strong acid and must be treated with respect.

Take great care when using it, don't get it splashed into your eyes, don't breath in the vapours, wear eye protection, wear gloves and ensure arms and legs are covered with long clothing.

There is no need to use the full strength acid that comes in the bottles from the hardware store, dilute it down. Never add water to the concentrated acid solution, that is a very dangerous thing to do, only add acid to the water.

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