Our general advice has always been to keep the pump/filter running so that the chlorine will kill off the algae and allow the filter to catch it, and that seems to have always worked in the past. However...this year in particular there are so many more people with cloudy water conditions that won't clear up than we've ever had, and pools that are not responding to the methods that have always worked before. We're not sure why, but we're thinking it had to do with the overabundance of algae this year, probably partly due to the warmer winter we've had. Ben is working on a theory that, in some cases, the algae is being pushed through the filter media, thus breaking it into even smaller particles that the filter then can't catch. This can happen with oversized pumps, undersized filters, DE or cart filters with live algae, or even some sand filters in pools overloaded with dead algae, as well as pools where the owners have put assorted "goop" into their pool before coming here in an effort to solve their problems. Some of that "goop" doesn't work so well with filtering. So...the advice we're giving now is sort of more dependent on each person's equipment and situation, rather than a blanket one-size-fits-all situation.