Green spa water usually results from one, or a combination of the following;
1. Insufficient sanitiser/algae growth
2. Oxidation of copper
3. Pollen in the water (more of a summer issue)
If you want to avoid emptying the water and starting again, consider the following;
Removing Algae: For an algae problem treat with an appropriate algaecide. Brush the surfaces of the hot tub before adding these chemicals to enhance the effectiveness of the treatment. Also, allow the pump to continue to run in order to circulate the additive.
Removing Oxidised Metals: For an excess copper issue, adding a sequestering or chelating agent will cause metal ions to group together in complexes that are easier to filter out of the water. It is important to clean or replace your filter after using a sequestering agent.
Removing Pollen: Use a flocculent so that the particles group together and the filter can isolate them.
More in-depth analysis of treating green hot tub water >
https://www.cleanmyhottub.co.uk/hot-tub-water-green/
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