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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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