Hi I have been looking at the forum for some time and find it really useful.
I have had the pool for 5 years and had no insurmountable problems. I now find myself a bit confused.
When I am vaccuming the pool after about 5 minutes the water returning to the pool becomes discoloured. I assumed it was a problem with the multiport valve (it is an Astralpool 6 way) I changed the spider gasket but it made no difference. When the valve top was off I had a look and there were no obvious breaks (the spider gasket also looked OK but I kind of hoped I also backwashed the sand filter and even took the lid off the sand filter and gave it a good stir (and backwashed again!)
So I am doing nothing different to what I have done in the past, I get the impression that not all the dirty water is going back in as it is only slightly discoloured, any ideas?