Answer:

Certainly chemistry is an important part of eliminating green water, most likely from algae. However, it is also important that proper filtration is taking place. You may need to clean or replace filtration media or cartridge and run the filter (pump) 24/7 until it clears up. If everything is in order for proper circulation/filtration then it is time to take a closer look at the chemistry. There are chemical treatments that specifically address green water, most of which work in conjunction with your chlorine chemistry (tabs and shock). You may want to try some shock to supplement the tabs if you have not done that to make sure that you establish a chlorine residual.