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I have found that the best & fastest way to clean up a problem like that is to vacuum straight out to waste. Re-fill and do it as many times as it takes until you have just a mild green. Then shock & run the filter. This process is time consuming since you have only a short time to vacuum before the water level dips below skim line. when re-filling get the water level as high as possible by closing the valve or moving it to filter. As to why it happened....I don't know, but hope this answer will help on getting it cleaned up.
ANSWER::
It happened because maintenance was not performed on the pool -- chlorine levels maintained, shocking the pool about once per week, adjusting the pH and alkalinity. Neglect is a word for this. If you do not have a vinyl liner do the following:
Back wash filter
add 4 gallons of 12% chlorine
add either one bottle Yellow Treat or Yellow Out, as per instructions on label.
Filter for 24/7 unless Yellow Treat indicates otherwise. One bottle should be sufficient.
Brush walls and floor thoroughly using a pattern so that you do not miss a square inch of plaster in the brushing --- 2 - 3 times daily until ALL signs of algae are gone.
Back wash filter again next day.
By 3rd day things should be looking brighter.
Maintain then on 1.5 to 3.0 chlor.
72-.2 - 7.6 pH
Readjust your chlorine to 3.0 - 5.0 again
What else can I help you with?
What color do you have to paint your pool for the water to be green?
Green
Why is the pool green in Rio?
The pool turned green in Rio due to an imbalance in the pool's chemicals, specifically the pH levels, which caused algae to grow and give the water a green tint.
Can you get sick swimming in a green pool?
The color of the pool is no problem at all. If the water is green, who in his right mind would jump in?
You heard new pool water is green and turns blue in a few days is this true?
You have to treat pool water with pool chemicals and use a pool filter to get and keep the water clear.
What do the swampy Cree eat?
swampy leaves and water and dirt
Why would a salt water swimming pool turn blonde hair green?
It is not the salt water pool or the salt water that is turning your hair green. It is a poorly maintained pool with a chemical imbalance - pH and total alkalinity out of required parameters.
Can a solor pool cover cause green water?
I am not sure why this has not been answered. The most common reason for the green is algae growth. If you put on a solar cover and ignore pool maintenance, then the algae will grow as the water heats and when you remove the cover, the pool will be green
How do you get your water clean not green in a saline pool?
You must first determine the cause of the green water - then rectify that. The green water could be the result of the equipment not functioning correctly, or not being operated correctly, or being undersized for your pool. Or it could be a water balance problem.
I just vacuumed my pool but how do I clean the green pool water with out losing any of the water from the pool?
Shock it. Sold at Walmart, Lowes, or possibly your grocery store.
How do you get rid of really green water in above ground pool?
Green pool water is caused by algae. To remove the algae, bring the pH level of the water to 7.8, scrub the sides and bottom of the pool, shock the water with chlorine, then vacuum up all the dead algae.
Why the pool water is green but all parameters are ok?
The pool water is green because of algae- which is a type of plant. You just need to add more chlorine to kill off the algae...
Why is the diving pool in Rio green?
The diving pool in Rio turned green due to an imbalance in the pool's chemicals, specifically a lack of proper maintenance and monitoring of the water quality. This caused algae to grow and change the color of the water.
