They convert salt into chlrorine to sanitize the pool water...
http://www.poolpartsonline.com/p-509-aqua-rite-electronic-chlorine-generator.aspx
To answer you question yes a Saltigem can run Magnesium Salt. Infact all salt chlorinators can run Magnesium.
Salt is NaCl from which Chlorine gas (also known as mustard gas) is generated. So salt chlorinators are chlorine factories that produce chlorine gas from the salt molecule. Salt has a softening effect so feels smoother on the skin, creating an illusion of health. However, in the end you're still swimming in chlorine which is very unhealthy. Salt chlorinators are also extremely bad for the environment. Back washing salt water to sewerage systems has been banned in many parts of the USA due to damage from salt to natural waterways and wetlands.
Salt water pools have their own chlorinators built into the system. However if this is broken down or under performing you can augment it with any sort of pool chlorine.
Chlorine levels, PH levels, Salt levels, stabilizer level, Make sure salt chlorinators are set correctly, check timing so that pool is filtering for enough time to produce required chlorine.
Usually that means you put salt in the water: maybe 400 to 500 pounds for an average size pool in ground pool and you will then use a salt chlorinator in the water piping to zap a molecule off the salt to turn it into chlorine. It is self regulating so that you don't have burning eyes or an excessive chlorine smell in the water. Salt is much less expensive than buy chlorine in bottles and also safer as you won't damage your car if it spills. For that amount of salt you won't taste it in the water either. Most of the major pool manufacturers make salt chlorinators like; Hayward, Zodiac, Pentair etc. There are also pools that are full of salt like the ocean but that is not common. You can learn more about the specifications of salt chlorinators at millsco.com too. Marcus
Chlorinators cant do that if they are corectly conected. sugest you have an electician look at it be fore it cooks some one.
The same as in any chlorine pool toss a bit of extra chlorine in for starters, if this does not help get some algaecide from your pool shop. Not be careful that you use the right kind of algaecide as metal based products don't necessarily agree with salt water chlorinators.
To determine the amount of salt needed for a 16x32x8 inground pool, first calculate the volume of the pool in gallons. The volume is approximately 4,608 gallons. Most saltwater chlorinators require about 3,000 to 4,000 ppm (parts per million) of salt, which translates to roughly 50-75 pounds of salt for this volume. Therefore, you would typically need around 50-100 pounds of salt to achieve the desired salinity.
Salt chlorinators in my opinion are great. So long as the unit chosen to do the job is the right size for the pool you cant go past them there is no more handling corrosive chlorine as it is manufactured on the spot. they feel good to swim in. Now you can even choose salt other then Sodium chloride common salt. and get a Magnesium/potassium chloride pool which feels even better to swim in and you can use the backwash to water the garden and watch it thrive.
Chlorinators are often used to maintain the level of chlorine in swimming pools. They put chlorine into the water to kill bacteria. The chlorinator can be regulated so that the amount of chlorine is enough to disinfect the water but not enough to irritate the skin and eyes of swimmers.
Turn of the salt water chlorination and start adding chlorine the same as you would in an ordinary pool. The salt water in the pool will become less salty over time so you don't have to worry about changing the water. You could tidy it up a little by removing the saltwater chlorinator element or you could just leave it.
There are two types of salt based pool chlorinators. More expensive and less common are those with a separate salt tank and these will normally use tablet salt for water softeners. The more common type is where salt is added to the swimming pool itself. In the UK we most commonly use PDV salt - that is Pure Dried Vacuum Salt or table salt. Granular salt for water softeners can be used. Tablet salt for water softeners should be avoided unless you have a white liner, because the tablets may bleach spots on the pool liner before dissolving. Julian Hobday of KindWater.