Clear green water normally indicates metals. However, if metals do not test positive and product has been added for metals and the water is still green, it could be small-celled green algae. This algae growth is so tiny that it makes the water appear clear green rather than clouding it, which is common for the other algae types.
To kill small-celled green algae:
- Add 2 bags of Burn Out Extreme via the skimmer.
Apply Quick Clear according to label instructions for your filter type and size.
Circulate the water continuously.
Clean the filter with Filter Brite.