Green water usually means algae or sanitizer loss has already outrun the routine. The key is to confirm the numbers, support circulation, and use a measured recovery plan instead of guessing.
Treat green water as a sanitation warning first
A green tint is not just an aesthetic issue. It usually means chlorine has dropped low enough for algae or contamination to gain a foothold.
That is why the first move is a fresh test, not a blind dose. The pool needs a real reset plan, not just a bigger guess.
Support the recovery physically
Brush walls and steps, clear debris, and make sure the filter has a fair shot at the suspended material. A weak circulation system will drag out the cleanup.
Watch filter pressure closely during this phase. Green water often turns into a filter management problem just as much as a chemistry problem.
Keep watching how the pool responds
The key question is not whether the water improved for a few hours. It is whether chlorine starts holding and clarity keeps improving after the first cleanup cycle.
If it does not, step into diagnosis or call a professional. Green water that rebounds fast is telling you the root problem is still active.