The particles are a calcium carbonate residue that contains enough trapped air to float. These particles are common and are usually drawn in by the pump and trapped in your filter. They are completely harmless and easily dispersed using your hand or the leaf skimmer.
Corrective Action:
- Check to see that the weir flap (skimmer flap) on the skimmer is functioning properly, which will prevent any skimmer residue or other debris from returning to the pool.
- The flow rate through the skimmer my be slower than normal. Check your filter back-pressure and backwash or clean your filter element if needed.
- You may need to increase the flow through the skimmer by decreasing the flow from the main drain, but it's a good idea to consult your pool professional before making this kind of adjustment.
Preventative Follow-up:
Routine inspection will be sufficient, along with maintenance of proper skimmer action.
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