Pool Troubleshooting /
How to Get Rid of Green Pool Water
Green pool water usually means algae and weak filtration. Clear it by removing debris, brushing, cleaning the filter, restoring circulation, and testing water safely.
Archive date: this article was written for PoolSkimmer on Oct 23, 2026 and given the earlier archive date of Aug 10, 2026 so the blog reads as an organized archive. It was not published on that date.
First steps for green pool water When you are faced with a green pool, put aside the guesswork and focus on circulation and a thorough cleanup. The colour is typically a sign of algae and debris that have had their way because filtration or sanitation has not been up to par. Your immediate objective is to clear away the visible matter and get the filter working properly.
- Skim off any leaves or floating debris.
- Give the walls, floor, steps and ladders a good brush, including the perimeter.
- Once you have brushed, vacuum up what has settled.
- Make sure the skimmer basket is clean and the filter is in order.
Bear in mind that if the pump is not in proper working order, the water will remain green no matter how much sanitizer is put in.
The cause of the green In most instances, a green pool is an algae problem, one that low chlorine levels, poor water movement or lingering debris have encouraged. Filtration and cleanup can be hampered by a clogged skimmer, a dirty filter or a water level that is not right for the skimmer.
Then again, there are times when metals or some other chemistry issue is at play rather than algae. If the water is green but not slimy and brushing makes no difference to its look, it is prudent to do a careful test or put in a call to a pool professional.
Clearing the water safely There is a method to this. Follow the chemical labels and your equipment manual in a steady fashion:
1. Before you open or empty the skimmer basket, turn the pump off. 2. A long-handled skimmer will take care of the visible debris. 3. Dislodge any buildup on the fittings, ladders, steps and the like with a brush. 4. Use the manufacturer’s instructions to vacuum the material you have loosened. 5. Backwash or clean the filter as the system dictates. 6. Only adjust chemicals after testing the water and in accordance with the product label and pool manual.
When you are around pool chemicals or cleaning gear, wear the appropriate PPE. Never mix chemicals and stay clear of operating suction outlets.
Mistakes to avoid Some owners make errors that only prolong the issue or compound it:
- Letting the pump run while the filter is dirty or the skimmer basket is clogged.
- Brushing the debris loose and leaving it there.
- Putting in algaecide or chlorine without first running a test.
- Overlooking a bad water level or a circulation issue.
- Allowing swimming before the water is fully clear and sanitised.
If the filter is not given the attention it needs, green water has a habit of returning. The correct course of action will vary with the type of pool and its chemistry.
Time to get professional help? A qualified pool service should be contacted under these circumstances:
- The pool has been brushed, vacuumed and the filter cleaned, yet the green persists.
- There is reason to think the pump or circulation is at fault.
- You are seeing abnormal pressure on the filter or something more than routine maintenance is called for.
- The results of your water tests are inconclusive or at odds with what you see.
- Any unsafe condition exists, be it damaged equipment or an electrical fault.
Do not use the pool if there are electrical issues and certainly not in green water. Should you need to have a look at the pump strainer or skimmer, shut the pump down and refer to the manual. It is far safer and more effective to do a proper job of it than to rush in with chemicals.
Sources and further reading
- [Hayward: Weekly pool maintenance](https://www.hayward.com/maintenance/weekly-pool-maintenance)