No!
Perish the thought!
It's a standard sand filter.
but yes backwashing the filter fairly religiously is what we do. I think not being here for as long over the last two years may have had an effect. I'll get it sorted, just a matter of time and I first off have to source and fit a new pressure gauge as the old one is well fecked!
Thet'll tell me if I have anything serious to deal with, like a blocked pipe.
All I know is that we have had some very weird dirt/sand come over from the Sahara a year or two back. Where it settled on wall tops etc it turned them reddish. When I went to clear it off the bottom of the pool it was far more tenacious than most dust is, but I did manage to hoover it up.I am wondering now if it is sticking to the sand in a similarly tenacious fashion and that is why pressure or suction seems to be down despite all the visible filters being clean.
The sand dont last forever
Off to watch the F1 with no Suzy or grid girls
J