How to treat a green swimming poolCleaning a green pool can be done a few different ways and there are many factors to take into account so it’s often it is hard to predict how they will respond to treatment (even for us professionals!)

Often a green pool will require a fair degree of effort and manual labour to get it clean, however, how much effort is dependent on how long it has been green and how much debris is in the pool.

Generally speaking, pools that have been green for short periods and that you can see the bottom of the pool will clean up using a combination of chemicals to treat the water and the filtration system. Whereas those that have been green for longer, you cannot see the bottom, or those that contain lots of leaves and debris will require a lot more effort and a process called floccing.

Other factors that affect a green pool clean up include:

  • Size of the pool
  • How long the pool has been green
  • How much and what type of debris is at the bottom of the pool
  • How good the circulation/pump is
  • How new/efficient the filter media or cartridge element is

We recommend the following clean up procedure for green pools

*1 -6 is for pools that have been green for a short time, steps 7 onwards are for long term green pools

  1. Check the levels of chlorine, pH & Alkalinity at the pool shop & pick up any chemicals you need such as extra chlorine, acid/pH increaser, algaecide, clarifier & floc if necessary.
  2. Empty skimmer & pump baskets & detach suction cleaner & remove vacuum plate
  3. Backwash the filter thoroughly and check the pressure when finished (important to change gauge if it’s not working)
  4. Rake/scoop bottom to remove as much debris as possible & brush the pool walls. *We cannot emphasize enough that this must be done thoroughly because all the debris needs to be removed at some point and the more that can be removed now the better for the overall process. Use an algae brush depending on surface type, if you leave it until the pool is clear to give it a thorough brush it will likely end up green and cloudy again.
  5. Chemicals to add: non-copper algaecide, chlorine & acid (depending on pH), and strong clarifier as directed by your pool professional
  6. Leave filter running non-stop for 48 hrs and backwash thoroughly once per day and maintain a high chlorine level until clear.
  7. If no significant improvement is observed within 48hrs re-test chlorine and pH and ensure Chlorine is above 3.0ppm & pH is above 7.6
  8. Add liquid floc then run filter pump for two hours on re-circulate then turn the system off. Allow floc to settle for 48 hrs.
  9. If the pool water is clear and the debris has settled to the bottom, ensure the pool is fully topped up with water then proceed to vacuum the pool to waste.
  10. Sometimes you need to vacuum to waste more than once as the water level drops too low before you finish. Leave the equipment set up and don’t disturb the remaining debris. Refill the pool and finish the job.
  11. Check chlorine, pH, and Alkalinity levels and adjust as necessary. Add a clarifier and filter the pool to clear any remaining cloudiness.
  12. If after floccing, the pool does not clear and settle within 48 hrs it is likely it will not. The best option is to re-check the water balance for chlorine, pH & Alkalinity and adjust as necessary then re-start the filtering process backwashing once per day. If there is still no improvement after 48 hrs you will likely have to replace the filter media or cartridge element or floc the pool again.
  13. Once the pool is clear you will need to fully test and balance the water.

Call us on (03) 9758 3777 to find out your treatment options/requirements.

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