Is the pump / filtration plant working effectively and is the running time sufficient –12 hours in Summer?
Clean the weir and pump baskets and Backwash the filter.
Balance the pH to between 7.2 and 7.6.
Add 500ml New Aqua Dazzle for every 25,000 litres of pool water or use one Super Sheen sachet in the weir for dull water (where the bottom is still visible).
Run the pump for at least 12 hours and it would be advantageous to do a once-off 24-hour run.
Watch the filter pressure and Backwash, as necessary.