With a little work, you can quickly turn that water from that ugly green to a beautiful . A green pool simply means that algae has temporarily taken over and begun to After you have shocked your pool and removed all of the debris, your pool . 7 days ago - Find out why your pool is green and how to fix it. . anyway until it all filters out, but high pH will cause a VERY cloudy pool when using shock. Decrease your pH level. To fix a green pool, you'll need to start by decreasing the water's pH level. Add super shock chlorine. Next you'll need to give your pool a shock dosing of chlorine. Clear up the water. Kill off any algae. . you can start swimming. Read on to learn how to get rid of the dreaded green water. . Try to break it all up so that the pool gets thoroughly clean. If you have a vinyl pool, use a What did I do wrong and how can I fix it? wikiHow Contributor. There are only three things that will clear up a green swimming pool. . Make sure you have all the necessary chemicals and cleaning products that you will . Jul 13, 2015 - So you've got your pool up and running, cleaned out all of the leaves and dirt, and everything's looking good, then one day you look out and .