I recently changed my sand on my own for the first time. I got some information here as well as researching what to do elsewhere before taking on the project. I have an old brown Fox 300lb filter. I was very careful in taking out the old sand and careful not to damage the laterals. I was also careful to not get sand in the top vertical valve while pouring in. Now I am getting sand blown into the pool. I vacuumed the initial sand up and immediately saw new sand blowing into the pool. I don't know enough about how the filter works to know where it is coming from but assume it is coming from a lateral. If it is indeed the lateral, can laterals be replaced as a less expensive fix than buying a new filter? I am trying not to spend any more than I have to. My chlorinator box is not working on my Pure Swim SWG either.