I will try to keep this brief- if that's possible. My pool is at my vacation home. So I'm not there. I have SWG's for the pool and spa. I hired a pool person to manage my pool. They came once a week. Well they didn't watch the salt levels in the pool, I had a leak in the auto-fill line and the parameters set for the SWG didn't match the salt levels in the pool and the board for the SWG burned out. Well, this is what I'm told anyway. My pool turned green in less than 6 days. The pool guy was putting chlorine tabs with cya in the pool and sent my cya 150+. In the end, I told the pool guy he is done and hired a new pool company. They got the pool "sparkling" in 2 days. They also used an algaecide. So my question now is, once the SWG is up and running - is it necessary for them to keep adding this algaecide for "maintenance"? It is called "Yellow Treat" by United Chemical. I can't wait to get back to my home for the winter. It is so difficult to leave the pool maintenance to someone else.