If your pool is dark green bordering on a blackish color it may be more effective to drain the pool completely and acid wash the surface.
Clean green swimming pool water.
There will definitely not be any swimming enjoyment while the water is green.
You can however try to clear the green pool water first before choosing the nuclear option.
You can check your filters here too and clean them up for the next step if you wish.
You can drain all the water but unless it s too green and borderline black there is no need to drain all the water.
If even after knowing why your pool water turned green your swimming pool has become an abode for algae and bacteria time to clean it.
This can be done by shocking your pool with high levels of chlorine.
The only way to clean a green pool fast is to kill the algae that have bloomed in the water.
Continue this process until you notice the water changing color to either cloudy white light green or clear.
The experts at trouble free pool coined the s l a m.
Clean the filter often during this process.
Green water or any color other than pristine clear is a dangerous situation waiting to happen.
Method shock level and maintain.
Then cleaning is much easier than draining.
Rob at dengarden says if you can see at least six to eight inches below the surface of the water most likely the pool can be treated chemically.
Then add sodium bicarbonate to increase the ph or sodium bisulfate to decrease it.
The green water is probably algae which is unhealthy.
Shock the green pool.
After shocking the pool filtration becomes a key factor in clearing up a pool.
Start off by adding 3 or 4 gallons and if you see no results overnight add 3 or 4 more gallons the next day.
If your pool is very dirty it may need many gallons of liquid chlorine shock over a period of days before the water clears.
Other than that you can shock the pool to clean it.
To get rid of green water from a pool start by using a chemical test kit to test the chlorine and ph levels.
If the pool has been shocked and is no longer green but turns green again after a day or two check the water chemistry and pay particular attention to phosphates in the water.
You can test the sanitizer level too but facing facts we already know that s too low which is why you have green water in the first place.