I posted a few months ago with some truly horrifying pictures of an algae problem, and there has been dramatic improvement, but still I'm fighting it. I changed out my tds meter which had been faulty for a long time, and I was still getting about 12 tds out of brand new membranes and filters in my last ro/di unit. I changed to the BRS 5stage dual DI system and constantly produce 0tds water, coupled with algaefix marine there has been a serious reduction over the last two months, but still about half of it remains. Just looking for more options, thought about getting the probidio biodigest, and biooptim but don't really know much about these...any input will help, gotta resize a picture and Ill get it posted up here.