hey ive got a 22x52 intex above ground weve had it set up around 2-3 months now with a intex swg from day one pool has been awesome about a week ago i put a light in the pool that replaces the water inlet jet thingy so i had to drain about 10" of water or so from the pool i refilled it and carried on the pool after a few days started getting a green algie and the swg keept coming up low salt so i checked the level of salt and bought it back up to around 3800ppm well it kept saying low salt so i added some more were now around 4600ppm but its still saying low salt on the swg ,it will run for like 5 mins ant then throws the code 91 ,the plates were kinda white and scaley so i took it apart and soaked the plates until they were clean again put it back together and its still throwing the low salt light ,is this a water problem or im thinking a swg problem anyone had a similar problem and maybe be able to shed some light on the sitution because my kids are not happy with the pool out of action on there summer holidays