5.Bacteria grow in machine coolant. They make it smell bad and they are a health hazard. Filtering removes the sludge that bacteria use to breed as well as removing tramp oils that bacteria eat and filtering keeps oxygen in the water.
While regular sea salt is about 90% Sodium (which accounts for it's salty taste), salt extracted from the waters of the Dead Sea is only about 10% Sodium with the other 90% accounting for other minerals which are essential for proper skin function, but which are present in very small quantities in regular sea salt.
Most table salt also has added iodine, an essential nutrient that helps maintain a healthy thyroid. Sea salt and table salt have the same basic nutritional value, despite the fact that sea salt is often promoted as being healthier. Sea salt and table salt contain comparable amounts of sodium by weight. Whichever type of salt you enjoy, do so in moderation.