Algae can take over a pool in a matter of days when the circumstances line up: a week of heat after a storm dumps organic debris into the water, an equipment failure that interrupts circulation, or a vacation where no one was watching the chemistry. The pool turns green or yellow-green, the walls feel slick, and the water clarity drops to near zero. At that point, simply shocking the pool usually isn't enough—the question is whether the chemistry state allows a chemical recovery or whether the cyanuric acid concentration is so elevated that the available chlorine can't do its job, which means a partial drain is the more effective path.
Green pool recovery at K&D Quality starts with a full water test to determine which direction makes sense. If chemistry is recoverable, the process involves a shock dose calculated to the actual volume and contamination level, algaecide application, a filter run schedule designed to turn the water over aggressively, and a brush schedule to pull algae off the walls into suspension where the sanitizer can reach it. Check-ins are daily or every other day until the water clears, so adjustments can be made if the algae type is more resistant than the initial assessment suggested. Filter cleaning is included at the end because a filter that's processed a bloom is loaded with dead algae and won't run efficiently until it's cleared.
In San Jose, green pool calls spike after the first heavy fall rains and again after spring heat events, when water temperature rises faster than most homeowners' chemical routines adjust for. Green pool recovery handled correctly doesn't just restore water clarity—it brings the pool back into a stable chemistry baseline that holds. A homeowner at the end of a successful recovery has water they can swim in, a clean filter running at normal pressure, and an understanding of what tipped the balance so the same conditions don't produce the same outcome next time. That handoff is part of every recovery job.
