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Sanitiser
Chlorine

Can be manually dosed with liquid, tablet, or granular form. Alternatively, you may have a chlorine doser as shown above, drawing chlorine from a 60L holding drum to automatically feed into your pool.
Salt

These units always come with a cell and power pack as shown above. You need to search the salt ppm (parts per million) requirement for your chlorinator. It can easily be found by brand/model (the most common units require 4000-5000ppm of salt to produce enough chlorine).
If you use minerals, also select this option. The electrode inside the cell will split "Sodium Chloride (Salt)" into sodium and chloride (chlorine), then eventually they rebind before being reused. The same applies to minerals, which normally consist of "Magnesium Chloride", "Potassium Chloride" and "Sodium Chloride". You can add minerals to a salt pool and vice versa with no consequences.
Ioniser

Uses copper and/or silver electrodes. This will be plumbed in with the rest of your equipment. They are very rarely used in Australia due to the extreme heat overpowering copper as a sanitiser. Normally requires 800-1200ppm of salt to operate, however you need to check your brand/model.