We have a index filter pump 635T and it's connected to a saltwater system generator... We have had no issues with it since we bought it 3 weeks ago and since last week have had code 90 low flow we have cleaned everything and did what the book says???? We did notice that the electrolytic cell looses water when the system actually starts generating and within minutes it will throw a code 90? We have tilted and everything to remove air but it still does it when it starts to generate??????