The kit is 6 years old, not 12, so is it still ok? The pressure is not rising on the filter. I have not backwashed since a few days ago when you told me it's best not to do it daily, unless the pressure is rising.

In the last couple of hours, I can begin to see some changes - the water is beginning to look more blue than green, still cloudy, but the bottom of the pool next to the steps in the shallow end is now visible. So it seems there is finally starting to be some improvement.