We are new pool owners. Here is my biggest challenge at the moment - our Intex SWG is collecting salt scale at a rapid rate. We thought the the SWG we had was bad since it was giving a code 91 after only 1 1/2 weeks of run time. Found out I had the old model. So, I ordered a new SWG. After 5 days of running the new SWG, we had another code 91 and the titanium plates are caked again. My salt level is in range (3100 ppm) and all other tests are within range except the chlorine (since the SWG is not running). We are using vinegar to get the build-up off the plates, but from what I have researched so far, this should not happen weekly but be a part of maintenance every 4 months. I am at a loss here. There has to be something going on with my water to cause the build-up so quickly on 2 separate salt water systems. Please help.